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Old 01 November 2017, 06:42 PM
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GenYus234 GenYus234 is offline
Join Date: 02 August 2005
Location: Mesa, AZ
Posts: 26,699

IMS, the p's and q's is about how the letters are similar, but reversed, so someone learning to write might mix them uq.

ETA: From M-W:
from the phrase mind one's p's and q's, alluding to the difficulty a child learning to write has in distinguishing between p and q
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