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diff --git a/comp6771/1/src/word_ladder.h b/comp6771/1/src/word_ladder.h
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+++ b/comp6771/1/src/word_ladder.h
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+#ifndef COMP6771_WORD_LADDER_H
+#define COMP6771_WORD_LADDER_H
+
+#include <algorithm>
+#include <filesystem>
+#include <fstream>
+#include <numeric>
+#include <queue>
+#include <sstream>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+namespace word_ladder {
+// Given a file path to a newline-separated list of words...
+// Loads those words into an unordered set and returns it.
+auto read_lexicon(const std::string& path) -> std::unordered_set<std::string>;
+
+// Given a start word and destination word, returns all the shortest possible
+// paths from the start word to the destination, where each word in an
+// individual path is a valid word per the provided lexicon. Preconditions:
+// - from.size() == to.size()
+// - lexicon.contains(from)
+// - lexicon.contains(to)
+auto generate(const std::string& from, const std::string& to,
+              const std::unordered_set<std::string>& lexicon)
+    -> std::vector<std::vector<std::string>>;
+}  // namespace word_ladder
+
+#endif  // COMP6771_WORD_LADDER_H