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1. The sum of any integer and its inverse is always zero.
N E I V S E R
2. Changing the grouping of addends does not change the sum.
E T O I A C V A S I S
3. The sum of any integers is an integer.
U R E O S C L
4. The sum of any integer and 0 is that integer.
T I Y T D N I E
5. Changing the order of addends does not change the sum.
O T T U C E M M V A I