diff --git a/regex/nfa.go b/regex/nfa.go
index df37cdd..994dc96 100644
--- a/regex/nfa.go
+++ b/regex/nfa.go
@@ -51,54 +51,54 @@ func cloneState(start *State) *State {
 // Helper function for clone. The map is used to keep track of which states have
 // already been copied, and which ones haven't.
 // This function was created using output from Llama3.1:405B.
-func cloneStateHelper(state *State, cloneMap map[*State]*State) *State {
+func cloneStateHelper(stateToClone *State, cloneMap map[*State]*State) *State {
 	// Base case - if the clone exists in our map, return it.
-	if clone, exists := cloneMap[state]; exists {
+	if clone, exists := cloneMap[stateToClone]; exists {
 		return clone
 	}
-	if state == nil {
+	if stateToClone == nil {
 		return nil
 	}
 	// Recursive case - if the clone doesn't exist, create it, add it to the map,
 	// and recursively call for each of the transition states.
 	clone := &State{
-		content:         append([]int{}, state.content...),
-		isEmpty:         state.isEmpty,
-		isLast:          state.isLast,
-		output:          make([]*State, len(state.output)),
+		content:         append([]int{}, stateToClone.content...),
+		isEmpty:         stateToClone.isEmpty,
+		isLast:          stateToClone.isLast,
+		output:          make([]*State, len(stateToClone.output)),
 		transitions:     make(map[int][]*State),
-		isKleene:        state.isKleene,
-		assert:          state.assert,
-		zeroMatchFound:  state.zeroMatchFound,
-		allChars:        state.allChars,
-		except:          append([]rune{}, state.except...),
-		lookaroundRegex: state.lookaroundRegex,
-		groupEnd:        state.groupEnd,
-		groupBegin:      state.groupBegin,
-		groupNum:        state.groupNum,
+		isKleene:        stateToClone.isKleene,
+		assert:          stateToClone.assert,
+		zeroMatchFound:  stateToClone.zeroMatchFound,
+		allChars:        stateToClone.allChars,
+		except:          append([]rune{}, stateToClone.except...),
+		lookaroundRegex: stateToClone.lookaroundRegex,
+		groupEnd:        stateToClone.groupEnd,
+		groupBegin:      stateToClone.groupBegin,
+		groupNum:        stateToClone.groupNum,
 	}
-	cloneMap[state] = clone
-	for i, s := range state.output {
-		if s == state {
+	cloneMap[stateToClone] = clone
+	for i, s := range stateToClone.output {
+		if s == stateToClone {
 			clone.output[i] = clone
 		} else {
 			clone.output[i] = cloneStateHelper(s, cloneMap)
 		}
 	}
-	for k, v := range state.transitions {
+	for k, v := range stateToClone.transitions {
 		clone.transitions[k] = make([]*State, len(v))
 		for i, s := range v {
-			if s == state {
+			if s == stateToClone {
 				clone.transitions[k][i] = clone
 			} else {
 				clone.transitions[k][i] = cloneStateHelper(s, cloneMap)
 			}
 		}
 	}
-	if state.lookaroundNFA == state {
+	if stateToClone.lookaroundNFA == stateToClone {
 		clone.lookaroundNFA = clone
 	}
-	clone.lookaroundNFA = cloneStateHelper(state.lookaroundNFA, cloneMap)
+	clone.lookaroundNFA = cloneStateHelper(stateToClone.lookaroundNFA, cloneMap)
 	return clone
 }