What changes at every step
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Step 1VEAL -> DEAL
Tile 1 changes V to D; the move is sideways by letter shape. DEAL has 16 legal neighbors, 1 shortest continuation, and 5 moves remaining. Other legal exits from VEAL include TEAL, PEAL, REAL, SEAL.
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Step 2DEAL -> DELL
Tile 3 changes A to L; the move is sideways by letter shape. DELL has 14 legal neighbors, 1 shortest continuation, and 4 moves remaining. Other legal exits from DEAL include DUAL, DEAN, DEAR, DIAL.
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Step 3DELL -> DOLL
Tile 2 changes E to O; the move is closer by letter shape. DOLL has 10 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from DELL include TELL, BELL, DULL, DILL.
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Step 4DOLL -> POLL
Tile 1 changes D to P; the move is closer by letter shape. POLL has 12 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from DOLL include ROLL, TOLL, BOLL, LOLL.
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Step 5POLL -> POOL
Tile 3 changes L to O; the move is closer by letter shape. POOL has 8 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from POLL include ROLL, TOLL, PULL, PILL.
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Step 6POOL -> POOP
Tile 4 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 POOL include POOR, POOF, TOOL, COOL.