1 files changed, 1 insertions, 19 deletions

diff --git a/cppbnf.cpp b/cppbnf.cpp
index 4f0b758..d5ffa12 100644
--- a/cppbnf.cpp
+++ b/cppbnf.cpp
@@ -21,30 +21,12 @@ namespace {
   return result;
  }
 
- std::unordered_map<std::string, std::unordered_set<std::string>> reverseBNF(const BNF& bnf)
- {
-  std::unordered_map<std::string, std::unordered_set<std::string>> result;
-  for (const auto& [symbol, lists] : bnf) {
-   for (const auto& list : lists) {
-    for (const auto& i : list) {
-     auto it = result.find(i);
-     if (it == result.end())
-      result.emplace(i, std::unordered_set<std::string>{symbol});
-     else
-      it->second.insert(symbol);
-    }
-   }
-  }
-
-  return result;
- }
-
  size_t numberOfStartSymbols(const BNF& bnf)
  {
   // exactly 1 start symbol
   std::vector<std::string> startSymbols;
 
-  auto reverse{ reverseBNF(bnf) };
+  auto reverse{ Reverse(bnf) };
 
   for (const auto& [symbol, lists] : bnf) {
    if (reverse.find(symbol) == reverse.end())