Puzzle 55: Slovak Sums

Here’s another GP preview puzzle. It’s a bit degenerate, but maybe it’s still useful? For this type, there’s a bit more material out there:

slovaksumsRules Place digits from 1 to 4 in some blank cells, so that each row and column contains each digit exactly once. Clue numbers indicate the sum of orthogonally adjacent digits. The number of circles under a clue number indicates the number of digits involved in this sum. Or see the instruction booklet.

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