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Example

We have [7]₅ = [2]₅ and [9]₅ = [4]₅. Consequently,

[7+9]₅ = [2+4]₅ = [6]₅ = [1]₅.

When dealing with e.g.

[3]₅ = {..., -7, -2, 3, 8, 13, ...}

we need not take the "canonical" representative 3 but may also choose -2 or 8 as the representative for computation.