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Use "5th" in a sentence
"Conner said his "time as Legion 6 has been all too brief," referring to the title 5th Group soldiers give to their commander."
"To minimize both standby as well as high performance power consumption, NVIDIA added what it calls a 5th "stealth" core to Kal-El."
"No Child Left behind was a JOKE - I know a 15 year old that cannot Cursive write, has trouble with spelling, vocabulary that he should have learned back in 5th grade in North Carolina."