one-first two-secone there_
there-third four-fourth five-fifth six-sixth seven-seventh eight-eighth
eight-eighth nine-ninth ten-tenth elven-elventh twleve-twlfth
序数词 first second third fourth fifth sixth seventh eighth ninth tenth eleventh twevlfth thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenth twentieth twenty- first twenty-second twenty-third twenty-fourth twenty-fifth twenty-sixth twenty-seventh twenty-eighth twenty-ninth tirtieth 13 thirteen 14 fourteen 15 fifteen 16 sixteen 17 seventeen 18 eighteen 19 nineteen 20 twenty 21 twenty-one 22 twenty-two 23 twenty-three 24 twenty-four 25 twenty-five 26 twenty-six 27 twenty-seven 28 twenty-eight 29 twenty-nine 30 thirty
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