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The letter "n"
"n"
The letter N -- although, strictly speaking, the letter N does occur once in "an hour."
Your period occurs once a month.
The letter D
Implies that something occurs once every month.
The letter "e." The letter "n."
July
Letter e
How about the letter E.
the letter n ;)
A bimonthly is a publication which occurs either once every two months or twice a month.