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static LS words2_plusApostrophe(S s) { new L l; int n = l(s); for (int i = 0; i < n; ) { int j = i; while (j < n && isLetterOrDigitOrApostrophe(s.charAt(j))) ++j; if (j > i) l.add(substring(s, i, j)); while (j < n && !isLetterOrDigitOrApostrophe(s.charAt(j))) ++j; i = j; } ret l; }