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Repeating cycles and position mod n
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4-point ladder

Repeating cycles and position mod n, 4-point ladder

●●○4 points, difficulty 2 of 34 pt

Two steps, or one step plus a trap.

3 in a row to finish this ladder.

0/3 solved

KA-0014

about 60s

Beads are threaded in the repeating order red, green, blue, yellow. What colour is the 30th bead?