What changes at every step
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Step 1CARS -> CAMS
Tile 3 changes R to M; the move is sideways by letter shape. CAMS has 18 legal neighbors, 1 shortest continuation, and 4 moves remaining. Other legal exits from CARS include CATS, CAPS, CANS, CARP.
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Step 2CAMS -> CAMP
Tile 4 changes S to P; the move is closer by letter shape. CAMP has 11 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from CAMS include CAME, CATS, CAPS, CANS.
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Step 3CAMP -> COMP
Tile 2 changes A to O; the move is closer by letter shape. COMP has 8 legal neighbors, 2 shortest continuations, and 2 moves remaining. Other legal exits from CAMP include RAMP, CAME, LAMP, CARP.
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Step 4COMP -> COOP
Tile 3 changes M 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 COMP include POMP, COUP, ROMP, COME.
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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.