What changes at every step
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Step 1SUIT -> SLIT
Tile 2 changes U to L; the move is sideways by letter shape. SLIT has 12 legal neighbors, 2 shortest continuations, and 4 moves remaining. Other legal exits from SUIT include SHIT, SPIT, SKIT, SNIT.
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Step 2SLIT -> SLOT
Tile 3 changes I to O; the move is closer by letter shape. SLOT has 14 legal neighbors, 2 shortest continuations, and 3 moves remaining. Other legal exits from SLIT include SLIP, SLIM, CLIT, SLID.
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Step 3SLOT -> PLOT
Tile 1 changes S to P; the move is closer by letter shape. PLOT has 8 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from SLOT include SLOP, SLOW, BLOT, SOOT.
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Step 4PLOT -> PLOP
Tile 4 changes T to P; the move is closer by letter shape. PLOP has 11 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from PLOT include PLOW, PLOY, PLOD, PLAT.
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Step 5PLOP -> POOP
Tile 2 changes L to O; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from PLOP include PROP, FLOP, PLOW, PLOY.