394:) is often treated as a basic unit and can be referred to as "one tenth", meaning "one tenth of a thou" or "one ten thousandth". Other common terms used in machining with Imperial units involve adding tenths together to achieve a specific tolerance or measurement. For example, "five tenths," is typically a measurement or tolerance of five ten-thousandths of an inch, and written as 0.0005 inches. "Three tenths," as another example, is written as 0.0003 inches
29:
588:
craft fashion: on-site, by feel, rather than at a distance working from drawings and written notes. Although measurement was certainly a part of the daily routine, the highest-precision aspects of the work were achieved by feel or by gauge, not by measuring (as in determining counts of units). This in turn limited the kinds of
587:
be controlled to high accuracy, but this was done by comparative methods: comparison against templates or other gauges, feeling the degree of drag of calipers, or simply repeatably cutting, relying on the positioning consistency of jigs, fixtures, and machine slides. Such work could only be done in
615:
is accomplished, it is unclear to the naked eye, being discernible but not useful for measuring.) During the following half century, such measuring instruments, previously expensive rarities, became widespread, everyday tools among machinists. Bringing more
952:
397:
Machining "to within a few tenths" is often considered very accurate, and at or near the extreme limit of tolerance capability in most contexts. Greater accuracy (tolerance ranges inside one tenth) apply in only a few contexts: in
294:
In the manufacture of older automobile engines. A typical example is the thickness of the head gasket, or the amount of material to be removed from the head to adjust the compression ratio of the cylinders.
495:... instead of our engineers and machinists thinking in eighths, sixteenths and thirty-seconds of an inch, it is desirable that they should think and speak in tenths, hundredths, and thousandths ...
503:
in place of fractions based on successive halving; but in mentioning thousandths, he was also broaching the idea of a finer division than had been used previously. Until then, workers such as
1592:
1000:
2118:
1574:
628:
made at different firms who did not have any contact with (or even awareness of) each other—yet still being sure that their products would have the desired
165:
1567:
838:
2082:
982:
579:). Each 64th is about 16 thou. Communication about sizes smaller than a 64th of an inch was subjective and hampered by a degree of
1560:
406:
manufacturing or calibration, they are typically expressed in millionths of an inch or, alternatively, in micrometres; in
767:
805:
729:
487:
The introduction of the thousandth of an inch as a base unit in engineering and machining is generally attributed to
519:
measured only in traditional fractions of an inch, divided via successive halving, usually only as far as 64ths (1,
266:
The thickness of items such as paper, film, foil, wires, paint coatings, latex gloves, plastic sheeting, and fibers
1536:
648:
297:
In the servicing of older automobile engines. Typical examples include a spark-plug gap or ignition points gap.
51:
1583:
135:
115:
583:—while phrases such as "scant 64th" or "heavy 64th" were used, they were imprecise. Dimensions and geometry
975:
853:
1541:
753:
2077:
1531:
899:
451:. Today both terms are used, but in specific contexts one is traditionally preferred over the other.
2108:
2113:
2103:
968:
659:
607:
throughout the trade, as the unit is too small to be measured with practical repeatability using
288:
1970:
1407:
703:
625:
599:
The introduction of the thou as a base unit for machining work required the dissemination of
589:
301:
217:
826:
2046:
1996:
1423:
157:
910:
8:
2062:
2036:
2021:
1524:
1478:
1448:
621:
604:
792:
2072:
2067:
1519:
1509:
747:
593:
437:
was once the more common term, but as use of the metric system has become more common,
320:
There are also compound units such as "mils per year" used to express corrosion rates.
312:
60:
928:
1069:
1024:
801:
735:
725:
279:
611:
alone. (Most rule markings were far too wide to mark a single mil, and even if such
880:
620:
into machining made possible, for example, designing an assembly in the form of an
488:
188:
1965:
1865:
1463:
629:
612:
600:
1552:
33:
2041:
2001:
1870:
1493:
1468:
1428:
1361:
1320:
1270:
991:
500:
407:
226:
in Latin). In international engineering contexts, confusion can arise because
111:
56:
2097:
1944:
1906:
1840:
1514:
1473:
1438:
1376:
1290:
1094:
1089:
276:
Card stock thickness in the United States, where mils are also called points.
259:
739:
222:
2016:
1991:
1901:
1886:
1820:
1656:
1641:
1453:
1371:
1356:
1351:
1336:
1295:
1260:
1234:
1125:
1079:
1064:
580:
351:
37:
2031:
2011:
1891:
1825:
1799:
1758:
1694:
1684:
1679:
1674:
1626:
1621:
1616:
1488:
1443:
1366:
1341:
1275:
1265:
1214:
1140:
1130:
1120:
1115:
1110:
1044:
1039:
1034:
719:
677:
516:
508:
403:
368:
363:
305:
255:
205:(used for both singular and plural) or, particularly in North America, a
304:(PCBs). However, the component dimensions are now typically provided in
2026:
2006:
1975:
1949:
1794:
1763:
1753:
1732:
1727:
1722:
1717:
1636:
1458:
1433:
1402:
1219:
1209:
1183:
1178:
1168:
1163:
1059:
663:
504:
475:
471:
399:
391:
339:
243:
239:
144:
840:"...the smallest move of one-tenth (not 0.1 but 0.0001 of an inch)..."
1921:
1845:
1804:
1381:
914:
884:
617:
512:
415:
411:
387:
1916:
1748:
1386:
1300:
1255:
1204:
1939:
1646:
1483:
1074:
960:
270:
1835:
1778:
1285:
1239:
1173:
1054:
854:"Beginner's Guide To Reading Machine Shop Numbers & Values"
653:
161:
71:
1896:
1773:
1346:
1229:
1188:
724:. Joe Bennett. Milwaukee, WI: H. Leonard. 2002. p. 164.
608:
197:
28:
194:
1830:
1768:
1689:
1651:
1631:
1611:
1280:
1224:
1135:
1084:
1049:
1029:
1014:
464:
179:
125:
1911:
328:
The word "mil" appears in the following different units:
454:
262:
in non-metric countries. For example, in specifying:
794:
Basic
Integrated Circuit Technology Reference Manual
592:
that could work, because they limited the degree of
2119:
Customary units of measurement in the United States
191:
800:. US: Integrated Circuit Engineering Corporation.
1582:
701:
421:
2095:
953:"A Paper on Standard Decimal Measures of Length"
708:. Canada: Alfred Music Publishing. p. 146.
220:of the English and Latin words for "thousand" (
915:How Many? A Dictionary of Units of Measurement
885:How Many? A Dictionary of Units of Measurement
791:Skinner, Richard D., ed. (1993). "Packaging".
273:are about 30 thou (0.76 mm) in thickness.
1568:
976:
467:(1 international inch is equal to 1,000 thou)
282:(diameter) of strings in stringed instruments
390:where the thou is used, 0.0001 inches (2.54
238:is also a common colloquial clipped form of
254:The thou, or mil, is most commonly used in
230:is a formal unit name in North America but
1575:
1561:
983:
969:
876:
874:
242:. The units are considerably different: a
40:have a thickness of 0.03 inches (30 thou).
27:
702:Carruthers, John; Hurwitz, Tobia (2014).
900:University of Queensland: PCB design FAQ
860:. Amazon Services LLC Associates Program
871:
790:
499:Whitworth's main point was to advocate
2096:
1556:
964:
895:
893:
1593:Comparison with imperial unit system
455:Equivalents in other units of length
359:10 sq in) = π/4 square mil
182:, a thousandth is commonly called a
1001:Comparison with US customary system
482:
323:
13:
990:
926:
890:
843:, Dan Nelson, The CNC Toolbox, p89
678:"Paper weight comparison and more"
478:(1 millimetre is about 39.37 thou)
371:≈ 0.057296 degrees (also known as
308:, because they are sold worldwide.
249:
14:
2130:
2083:Foot–pound–second system of units
768:"The Gerber Format Specification"
448:avoid confusion with millimetres
335:= 0.0254 mm (0.001 in)
187:
946:
920:
904:
773:. Ucamco. July 2014. p. 30
705:Guitar Care and Gear Essentials
1537:Foot–pound–second system (FPS)
846:
832:
820:
816:– via Smithsonian Chips.
784:
760:
712:
695:
670:
641:
445:among most technical users to
166:a system of units using inches
1:
1584:United States customary units
635:
287:Manufacturing dimensions and
311:Tolerance specifications on
7:
1542:Twenty-foot equivalent unit
933:Imperial Measures of Length
827:"Corrosion Rate Conversion"
10:
2135:
1976:Kilopounds per square inch
355:= 0.0005067 mm (7.854
269:For example, most plastic
246:is approximately 39 mils.
2078:English Engineering Units
2055:
1984:
1958:
1932:
1879:
1858:
1813:
1787:
1741:
1710:
1703:
1667:
1599:
1590:
1532:English Engineering units
1502:
1416:
1395:
1329:
1313:
1248:
1197:
1156:
1149:
1103:
1007:
998:
379:
343:= 0.00064516 mm (1.0
131:
107:
103:
85:
77:
67:
50:
45:
26:
21:
16:Non-metric unit of length
1985:Other units and measures
1417:Other units and measures
660:Oxford University Press
1971:Pounds per square inch
1408:Pounds per square inch
752:: CS1 maint: others (
594:separation of concerns
497:
433:In the United States,
302:printed circuit boards
221:
1607:Thousandth of an inch
1020:Thousandth of an inch
656:UK English Dictionary
493:
154:thousandth of an inch
22:Thousandth of an inch
2047:Ton of refrigeration
1997:British thermal unit
1424:British thermal unit
491:who wrote in 1857:
463:0.001 international
459:1 thou is equal to:
2063:American wire gauge
2037:Pound-foot (torque)
2022:Foot-pound (energy)
858:machinistguides.com
622:engineering drawing
347:10 sq in)
313:hydraulic cylinders
300:The manufacture of
98:... is equal to ...
46:General information
2073:Body jewelry sizes
2068:Avoirdupois system
1510:Avoirdupois system
955:, Manchester, 1857
829:, Corrosionist.com
624:, then having the
596:that could occur.
141:
133:
122:
109:
2091:
2090:
1854:
1853:
1550:
1549:
1309:
1308:
666:on July 13, 2021.
150:
149:
86:Conversions
2126:
1708:
1707:
1577:
1570:
1563:
1554:
1553:
1154:
1153:
985:
978:
971:
962:
961:
956:
950:
944:
943:
941:
940:
924:
918:
908:
902:
897:
888:
878:
869:
868:
866:
865:
850:
844:
836:
830:
824:
818:
817:
815:
814:
799:
788:
782:
781:
779:
778:
772:
764:
758:
757:
751:
743:
716:
710:
709:
699:
693:
692:
690:
689:
674:
668:
667:
662:. Archived from
645:
601:vernier calipers
578:
577:
573:
568:
567:
563:
558:
557:
553:
548:
547:
543:
538:
537:
533:
528:
527:
523:
489:Joseph Whitworth
483:History of usage
450:
449:
358:
346:
324:Mil-measurements
204:
203:
200:
199:
196:
193:
177:
176:
172:
142:
134:
123:
110:
31:
19:
18:
2134:
2133:
2129:
2128:
2127:
2125:
2124:
2123:
2109:Units of length
2094:
2093:
2092:
2087:
2056:Related systems
2051:
1980:
1966:Inch of mercury
1954:
1928:
1875:
1866:Feet per second
1850:
1809:
1783:
1737:
1699:
1663:
1595:
1586:
1581:
1551:
1546:
1503:Related systems
1498:
1464:Horsepower-hour
1412:
1391:
1325:
1305:
1244:
1193:
1145:
1099:
1003:
994:
989:
959:
951:
947:
938:
936:
925:
921:
917:by Russ Rowlett
909:
905:
898:
891:
887:by Russ Rowlett
879:
872:
863:
861:
852:
851:
847:
837:
833:
825:
821:
812:
810:
808:
797:
789:
785:
776:
774:
770:
766:
765:
761:
745:
744:
732:
718:
717:
713:
700:
696:
687:
685:
682:paper-paper.com
676:
675:
671:
647:
646:
642:
638:
590:process designs
575:
571:
570:
565:
561:
560:
555:
551:
550:
545:
541:
540:
535:
531:
530:
525:
521:
520:
485:
457:
447:
446:
431:
422:Usage notes on
384:
356:
344:
326:
252:
250:Contexts of use
218:shortened forms
190:
186:
174:
170:
169:
140:
132:
121:
108:
81:thou, mil
41:
17:
12:
11:
5:
2132:
2122:
2121:
2116:
2114:Decimalisation
2111:
2106:
2104:Imperial units
2089:
2088:
2086:
2085:
2080:
2075:
2070:
2065:
2059:
2057:
2053:
2052:
2050:
2049:
2044:
2042:Spinning count
2039:
2034:
2029:
2024:
2019:
2014:
2009:
2004:
2002:Degree (angle)
1999:
1994:
1988:
1986:
1982:
1981:
1979:
1978:
1973:
1968:
1962:
1960:
1956:
1955:
1953:
1952:
1947:
1942:
1936:
1934:
1930:
1929:
1927:
1926:
1925:
1924:
1919:
1909:
1904:
1899:
1894:
1889:
1883:
1881:
1877:
1876:
1874:
1873:
1871:Miles per hour
1868:
1862:
1860:
1856:
1855:
1852:
1851:
1849:
1848:
1843:
1838:
1833:
1828:
1823:
1817:
1815:
1811:
1810:
1808:
1807:
1802:
1797:
1791:
1789:
1785:
1784:
1782:
1781:
1776:
1771:
1766:
1761:
1756:
1751:
1745:
1743:
1739:
1738:
1736:
1735:
1730:
1725:
1720:
1714:
1712:
1705:
1701:
1700:
1698:
1697:
1692:
1687:
1682:
1677:
1671:
1669:
1665:
1664:
1662:
1661:
1660:
1659:
1649:
1644:
1639:
1634:
1629:
1624:
1619:
1614:
1609:
1603:
1601:
1597:
1596:
1591:
1588:
1587:
1580:
1579:
1572:
1565:
1557:
1548:
1547:
1545:
1544:
1539:
1534:
1529:
1528:
1527:
1522:
1512:
1506:
1504:
1500:
1499:
1497:
1496:
1494:Spinning count
1491:
1486:
1481:
1476:
1471:
1466:
1461:
1456:
1451:
1446:
1441:
1436:
1431:
1426:
1420:
1418:
1414:
1413:
1411:
1410:
1405:
1399:
1397:
1393:
1392:
1390:
1389:
1384:
1379:
1374:
1369:
1364:
1359:
1354:
1349:
1344:
1339:
1333:
1331:
1327:
1326:
1324:
1323:
1321:Miles per hour
1317:
1315:
1311:
1310:
1307:
1306:
1304:
1303:
1298:
1293:
1288:
1283:
1278:
1273:
1268:
1263:
1258:
1252:
1250:
1246:
1245:
1243:
1242:
1237:
1232:
1227:
1222:
1217:
1212:
1207:
1201:
1199:
1195:
1194:
1192:
1191:
1186:
1181:
1176:
1171:
1166:
1160:
1158:
1151:
1147:
1146:
1144:
1143:
1138:
1133:
1128:
1123:
1118:
1113:
1107:
1105:
1101:
1100:
1098:
1097:
1092:
1087:
1082:
1077:
1072:
1070:Gunter's chain
1067:
1062:
1057:
1052:
1047:
1042:
1037:
1032:
1027:
1022:
1017:
1011:
1009:
1005:
1004:
999:
996:
995:
992:Imperial units
988:
987:
980:
973:
965:
958:
957:
945:
919:
903:
889:
870:
845:
831:
819:
806:
783:
759:
730:
711:
694:
684:. Micro Format
669:
639:
637:
634:
501:decimalization
484:
481:
480:
479:
468:
456:
453:
430:
420:
408:nanotechnology
383:
378:
377:
376:
360:
348:
336:
325:
322:
318:
317:
316:
315:
309:
298:
295:
285:
284:
283:
277:
274:
251:
248:
216:The words are
148:
147:
138:
129:
128:
119:
105:
104:
101:
100:
95:
88:
87:
83:
82:
79:
75:
74:
69:
65:
64:
54:
48:
47:
43:
42:
32:
24:
23:
15:
9:
6:
4:
3:
2:
2131:
2120:
2117:
2115:
2112:
2110:
2107:
2105:
2102:
2101:
2099:
2084:
2081:
2079:
2076:
2074:
2071:
2069:
2066:
2064:
2061:
2060:
2058:
2054:
2048:
2045:
2043:
2040:
2038:
2035:
2033:
2030:
2028:
2025:
2023:
2020:
2018:
2015:
2013:
2010:
2008:
2005:
2003:
2000:
1998:
1995:
1993:
1990:
1989:
1987:
1983:
1977:
1974:
1972:
1969:
1967:
1964:
1963:
1961:
1957:
1951:
1948:
1946:
1943:
1941:
1938:
1937:
1935:
1931:
1923:
1920:
1918:
1915:
1914:
1913:
1910:
1908:
1907:Hundredweight
1905:
1903:
1900:
1898:
1895:
1893:
1890:
1888:
1885:
1884:
1882:
1878:
1872:
1869:
1867:
1864:
1863:
1861:
1857:
1847:
1844:
1842:
1839:
1837:
1834:
1832:
1829:
1827:
1824:
1822:
1819:
1818:
1816:
1812:
1806:
1803:
1801:
1798:
1796:
1793:
1792:
1790:
1786:
1780:
1777:
1775:
1772:
1770:
1767:
1765:
1762:
1760:
1757:
1755:
1752:
1750:
1747:
1746:
1744:
1740:
1734:
1731:
1729:
1726:
1724:
1721:
1719:
1716:
1715:
1713:
1709:
1706:
1702:
1696:
1693:
1691:
1688:
1686:
1683:
1681:
1678:
1676:
1673:
1672:
1670:
1666:
1658:
1655:
1654:
1653:
1650:
1648:
1645:
1643:
1640:
1638:
1635:
1633:
1630:
1628:
1625:
1623:
1620:
1618:
1615:
1613:
1610:
1608:
1605:
1604:
1602:
1598:
1594:
1589:
1585:
1578:
1573:
1571:
1566:
1564:
1559:
1558:
1555:
1543:
1540:
1538:
1535:
1533:
1530:
1526:
1523:
1521:
1518:
1517:
1516:
1515:English units
1513:
1511:
1508:
1507:
1505:
1501:
1495:
1492:
1490:
1487:
1485:
1482:
1480:
1477:
1475:
1474:Pound (force)
1472:
1470:
1467:
1465:
1462:
1460:
1457:
1455:
1452:
1450:
1447:
1445:
1442:
1440:
1437:
1435:
1432:
1430:
1427:
1425:
1422:
1421:
1419:
1415:
1409:
1406:
1404:
1401:
1400:
1398:
1394:
1388:
1385:
1383:
1380:
1378:
1377:Hundredweight
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1271:Fluid Scruple
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38:payment cards
35:
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20:
2017:Foot-lambert
1992:Bolt (cloth)
1606:
1454:Foot-poundal
1372:Long hundred
1352:Pound (mass)
1276:Fluid Drachm
1235:Trade gallon
1019:
948:
937:. Retrieved
932:
927:Edkins, Jo.
922:
906:
862:. Retrieved
857:
848:
839:
834:
822:
811:. Retrieved
793:
786:
775:. Retrieved
762:
721:Guitar facts
720:
714:
704:
697:
686:. Retrieved
681:
672:
664:the original
652:
643:
626:mating parts
598:
584:
581:ineffability
509:boilermakers
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352:circular mil
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215:
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183:
153:
151:
97:
92:
91:1 thou
68:Unit of
2012:Foot-candle
1945:Pound-force
1759:Fluid ounce
1695:Square mile
1685:Square yard
1680:Square foot
1675:Square inch
1444:Foot-candle
1215:Fluid ounce
1141:Square mile
1121:Square yard
1116:Square foot
1111:Square inch
935:. Jo Edkins
605:micrometers
517:Anglosphere
505:millwrights
404:gauge block
392:micrometres
369:milliradian
364:angular mil
306:millimetres
291:, such as:
256:engineering
168:. Equal to
124:0.001
52:Unit system
36:cards like
2098:Categories
2027:Horsepower
2007:Fahrenheit
1795:Board foot
1754:Tablespoon
1733:Cubic mile
1728:Cubic yard
1723:Cubic foot
1718:Cubic inch
1520:Winchester
1479:Pound-foot
1459:Horsepower
1449:Foot-pound
1434:Fahrenheit
1210:Tablespoon
1184:Cubic mile
1179:Cubic yard
1169:Cubic foot
1164:Cubic inch
1025:Barleycorn
939:2009-09-23
864:2023-04-28
813:2021-07-10
777:2014-08-27
688:2016-01-18
636:References
603:and screw
513:machinists
474:, or 25.4
418:are used.
416:picometres
412:nanometres
400:plug gauge
340:square mil
333:linear mil
289:tolerances
244:millimetre
240:millimetre
143:25.4
1846:Acre-foot
1805:Face cord
1525:Exchequer
1382:Ship load
748:cite book
618:metrology
388:machining
1959:Pressure
1749:Teaspoon
1396:Pressure
1301:Hogshead
1256:Chaldron
1205:Teaspoon
740:52282608
613:dividing
373:NATO mil
271:ID cards
209:(plural
136:SI units
112:imperial
57:Imperial
1940:Poundal
1742:Cooking
1711:Derived
1657:statute
1647:Furlong
1484:Poundal
1469:Kenning
1439:Rankine
1362:Quarter
1198:Cooking
1157:Derived
1075:Furlong
574:⁄
564:⁄
554:⁄
544:⁄
534:⁄
524:⁄
515:in the
470:0.0254
426:versus
173:⁄
1841:Barrel
1836:Bushel
1779:Gallon
1704:Volume
1600:Length
1429:Degree
1342:Drachm
1291:Barrel
1286:Bushel
1240:Gallon
1174:Hoppus
1150:Volume
1095:League
1055:Fathom
1008:Length
804:
738:
728:
654:Lexico
511:, and
465:inches
381:Tenths
178:of an
162:length
93:in ...
78:Symbol
72:Length
1933:Force
1922:Short
1902:Pound
1897:Ounce
1887:Grain
1859:Speed
1821:Minim
1814:Other
1774:Quart
1642:Chain
1357:Stone
1347:Ounce
1337:Grain
1314:Speed
1296:Stuck
1261:Minim
1249:Other
1230:Quart
1189:Tmcft
1126:Perch
1080:Cable
1065:Chain
798:(PDF)
771:(PDF)
649:"mil"
609:rules
585:could
280:Gauge
223:mille
118:units
63:units
2032:Perm
1917:Long
1892:Dram
1880:Mass
1831:Peck
1826:Gill
1800:Cord
1788:Wood
1769:Pint
1690:Acre
1668:Area
1652:Mile
1632:Yard
1627:Foot
1622:Link
1617:Hand
1612:Inch
1489:Span
1367:Slug
1330:Mass
1281:Peck
1266:Gill
1225:Pint
1136:Acre
1131:Rood
1104:Area
1085:Mile
1050:Yard
1045:Foot
1040:Link
1035:Hand
1030:Inch
1015:Twip
911:Thou
802:ISBN
754:link
736:OCLC
726:ISBN
439:thou
428:thou
402:and
367:≈ 1
258:and
236:mill
211:mils
184:thou
180:inch
175:1000
158:unit
34:ID-1
1950:Kip
1912:Ton
1764:Cup
1637:Rod
1403:Ksi
1387:Ton
1220:Cup
1060:Rod
913:at
883:at
881:Mil
630:fit
443:mil
435:mil
424:mil
414:or
234:or
232:mil
228:mil
213:).
207:mil
164:in
160:of
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892:^
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750:}}
746:{{
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680:.
658:.
651:.
632:.
576:64
569:,
566:32
559:,
556:16
549:,
539:,
529:,
507:,
476:μm
472:mm
410:,
198:aʊ
152:A
145:μm
126:in
116:US
61:US
1576:e
1569:t
1562:v
984:e
977:t
970:v
942:.
867:.
780:.
756:)
742:.
691:.
572:1
562:1
552:1
546:8
542:1
536:4
532:1
526:2
522:1
375:)
357:×
345:×
201:/
195:θ
192:ˈ
189:/
171:1
114:/
59:/
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