Word ladder: Difference between revisions

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 =={{header|Haskell}}==
 === Breadth-first search===
-First expands a ball around the starting word in the word space, until it's surface contains the goal (if possible). After that performs depth-first path-finding from the goal back to the center.
+The function first expands a ball around the starting word in the space of possible words, until the ball surface touches the goal (if ever). After that it performs depth-first path-finding from the goal back to the center.
 <lang haskell>import System.IO (readFile)