> Solution class is needed indeed. Also, to recognize correctly the
> number of solutions with the help of `len` procedure. If we return the
> dictionary it is not clear:
>
>>>> len({x: 3, y: 2})
> 2
>>>> [{x: 3, y: 2}, {x: 8, y: -3}]
> 2 (too)
>
Until a Solution class exists, the multi-solution case should come back like
the single solution: as a list.
So solutions will look like `[1]`, ` [1, 2]`, `[{x: 3, y: 2}]` or `[{x: 3, y:
2}, {x: 8, y: -3}]`.
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