What changes at every step
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Step 1WHIT -> WHIP
Tile 4 changes T to P; the move is closer by letter shape. WHIP has 7 legal neighbors, 1 shortest continuation, and 4 moves remaining. Other legal exits from WHIT include CHIT, WHAT, SHIT, WHIM.
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Step 2WHIP -> CHIP
Tile 1 changes W to C; the move is sideways by letter shape. CHIP has 9 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from WHIP include SHIP, WHAP, WHIM, WHIZ.
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Step 3CHIP -> CHOP
Tile 3 changes I to O; the move is closer by letter shape. CHOP has 7 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from CHIP include CLIP, CHAP, SHIP, CHIN.
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Step 4CHOP -> COOP
Tile 2 changes H to O; the move is closer by letter shape. COOP has 14 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from CHOP include CROP, CLOP, SHOP, CHAP.
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Step 5COOP -> POOP
Tile 1 changes C to P; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from COOP include LOOP, HOOP, BOOP, GOOP.