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WordPair solution for the 2018 AP Computer Science Exam -
public int numMatches() {
int cnt = 0;
for (WordPair wp: allPairs)
if (wp.getFirst().equals(wp.getSecond())
return cnt;
public WordPairList(String[] words) {
allPairs = new ArrayList<>();
for (int i=0; i<words.length; i++)
for (x=i+1; x<words.length; x++)
allPairs.add(new WordPair(words[i], words[x]);
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