05AB1E, 39 38 36 34 33 bytes
lεDV.•3и½:∍äaŠ•sk>4%"cuso"Yåi(}}O
Try it online! or Verify all test cases (as arranged by @sporeball)
I'll explain later, but .•3и½:∍äaŠ• is a compressed string.
05AB1E,
lyxal
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