What changes at every step
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Step 1TERM -> TERN
Tile 4 changes M to N; the move is sideways by letter shape. TERN has 6 legal neighbors, 1 shortest continuation, and 5 moves remaining. Other legal exits from TERM include TEAM, PERM, GERM, BERM.
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Step 2TERN -> TORN
Tile 2 changes E to O; the move is closer by letter shape. TORN has 14 legal neighbors, 2 shortest continuations, and 4 moves remaining. Other legal exits from TERN include TEEN, TURN, KERN, FERN.
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Step 3TORN -> TOON
Tile 3 changes R to O; the move is closer by letter shape. TOON has 11 legal neighbors, 4 shortest continuations, and 3 moves remaining. Other legal exits from TORN include BORN, PORN, TOWN, CORN.
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Step 4TOON -> TOOL
Tile 4 changes N to L; the move is sideways by letter shape. TOOL has 9 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from TOON include BOON, LOON, GOON, SOON.
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Step 5TOOL -> POOL
Tile 1 changes T to P; the move is closer by letter shape. POOL has 8 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from TOOL include COOL, WOOL, FOOL, TOOK.
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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, COOL, POLL.