毎月まいつき
maitsuki

Noun
Adverb

1. every month; each month; monthly

わたくし両親りょうしんにはかなら毎月まいつき手紙てがみきます。
watashiwa ryōshinniwa kanarazu maitsuki tegamio kakimasu
I never fail to write to my parents every month.
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