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Singular - Plural
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a toothbrush
tootbrushes
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a diagnosis
diagnoses
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a Swiss
Swiss
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a salmon
salmon
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a woman soldier
women soldiers
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a criterion
criteria
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a spacecraft
spacecraft
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a half
halves
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a son-in-law
sons-in-law
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an offspring
offspring
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a cappucino
cappucinos
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a vertebra
vertebrae
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a passer-by
passers-by
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a young person
the young / young people
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a hundred-dollar bill
hundred-dollar bills
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a show-off
show-offs
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a thief
thieves
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a 16-year-old student
16-year-old students
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an echo
echoes
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a roof
roofs
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a pair of scissors
pairs of scissors
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