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Erik the Outgolfer
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#*><>, 30 bytes cn"00:"ooo5Sdo"--:--"ooooo5Sdo Online test.

I feel link this is much simpler and more different than redstarcoder's algorithm, and thus I posted it as separate.

Replaces output in-place.

Erik the Outgolfer
  • 40.6k
  • 5
  • 45
  • 122