@woodee.eth
8809 = 6 (8 has 2 loops each, 0 has 1 loop, and 9 has 1 loop; 2 + 2 + 1 + 1 = 6)
2172 = 0 (None of these digits have loops)
6666 = 4 (Each 6 has 1 loop; 1 + 1 + 1 + 1 = 4)
9313 = 1 (9 has 1 loop; the others have 0 loops; 1 = 1)
8193 = 3 (8 has 2 loops, 9 has 1 loop; 2 + 1 = 3)
4500 = 2 (4 has 0 loops, 5 has 0 loops, and 0 has 1 loop each; 1 + 1 = 2)
7713 = 0 (None of these digits have loops)
Now, for 6581:
6 has 1 loop.
5 has 0 loops.
8 has 2 loops.
1 has 0 loops.
Thus, 1 + 0 + 2 + 0 = 3.
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