bool canShrink(const string& word, const Lexicon& english) {
if(word.empty()) {
words.push("");
return true;
}
for(int i=0; i<word.size(); i++) {
if(canShrink(word, english)) {
words.push(word);
return true;
}
}
}
int fib(int n) {
return fib(n,0,1);
}
int fib(int n, int base0, int base1) {
if(n==0) return base0;
if(n==1) return base1;
return fib(n-1, base1, base0+1);
}