Englishfor English speakers
variation
Noun
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A variation of something is the same thing, but changed a little bit.
The music is a variation of a Japanese song from the 1950s.
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Variation is the difference in amount, colour, size, etc. among many things.
There was a lot of variation in price among the stores.
formula
Noun
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A formula is a way to do something or solve a problem that does not change much.
There is no formula for making profit, yet many business people think there is.
The formula for converting from kilograms to pounds is mathx\ \mathrm{kg} \times 2.2/math
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Infant formula is a powder that you mix with water to make a drink for babies.