What changes at every step
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Step 1TINY -> TINK
Tile 4 changes Y to K; the move is sideways by letter shape. TINK has 18 legal neighbors, 1 shortest continuation, and 5 moves remaining. Other legal exits from TINY include TINS, TINE, TIDY, TING.
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Step 2TINK -> TONK
Tile 2 changes I to O; the move is closer by letter shape. TONK has 12 legal neighbors, 4 shortest continuations, and 4 moves remaining. Other legal exits from TINK include LINK, TANK, TICK, TINS.
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Step 3TONK -> TOOK
Tile 3 changes N to O; the move is closer by letter shape. TOOK has 13 legal neighbors, 5 shortest continuations, and 3 moves remaining. Other legal exits from TONK include HONK, BONK, CONK, TONE.
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Step 4TOOK -> LOOK
Tile 1 changes T to L; the move is sideways by letter shape. LOOK has 13 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from TOOK include BOOK, TOOL, COOK, HOOK.
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Step 5LOOK -> LOOP
Tile 4 changes K to P; the move is closer by letter shape. LOOP has 9 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from LOOK include BOOK, COOK, HOOK, LOOM.
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Step 6LOOP -> POOP
Tile 1 changes L to P; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from LOOP include COOP, HOOP, BOOP, GOOP.