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Don't forget the leafy greens

@Broderick Black:
Like spinach, for plenty of iron.

Translators do make mistakes, and we live in a world where overpaid
pundits routinely misuse words and mangle grammar in foolish ways.

Unless it's very clear a character customarily uses sub-standard grammar,
a translator should 'error' on the side of correct grammar (which is a funny
way to put it). While "we girls" may sound "too formal" to you, "us girls"
sounds just plain bad to me, like a sour note during a piano recital.