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1. Group 1
2. Group 2

Inverse of power of two

Negative times negative

Negative plus negative

Numbers without sign

a/b

Integer

Litre

multiplication

| x |

Positive

Negative, Positive and zero

Square root

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Numbers without sign plus 0

Negative

Natural

Whole

Cubic decimetre

Decimal

Fraction

a x b

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0.35

Absolute value