What changes at every step
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Step 1DING -> DONG
Tile 2 changes I to O; the move is closer by letter shape. DONG has 11 legal neighbors, 3 shortest continuations, and 5 moves remaining. Other legal exits from DING include DINE, SING, PING, DINO.
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Step 2DONG -> BONG
Tile 1 changes D to B; the move is sideways by letter shape. BONG has 12 legal neighbors, 1 shortest continuation, and 4 moves remaining. Other legal exits from DONG include DONE, DONS, LONG, SONG.
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Step 3BONG -> BONK
Tile 4 changes G to K; the move is sideways by letter shape. BONK has 13 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from BONG include BOND, BONE, BONY, LONG.
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Step 4BONK -> BOOK
Tile 3 changes N to O; the move is closer by letter shape. BOOK has 17 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from BONK include BOCK, HONK, CONK, BANK.
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Step 5BOOK -> BOOP
Tile 4 changes K to P; the move is closer by letter shape. BOOP has 12 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from BOOK include LOOK, COOK, BOOT, HOOK.
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Step 6BOOP -> POOP
Tile 1 changes B to P; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from BOOP include LOOP, COOP, HOOP, GOOP.