Today I was given a question that first I thought might be easy to solve but then no matter how hard I tried I couldn't solve it.(It's not really related to maths just some puzzle)
if:
$$ 9999=4\\ 8888=8\\ 6181=3\\ 1212=0 $$
Then: $$ 1991=? $$
2026-04-03 01:40:40.1775180440
Puzzling Sequence
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