Irregular nouns

There are some common irregular noun plurals:
woman = women
man = men
child = children
tooth = teeth
foot = feet
person = people
leaf = leaves
mouse = mice
goose = geese
half = halves
knife = knives
wife = wives
life = lives
loaf = loaves
cactus = cacti
focus = foci
phenomenon = phenomena
criterion = criteria
datum = data

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