introduce bitloops

src/main/java/puzzle/HintScores.java

@@ -82,6 +82,7 @@ public final class HintScores {
                try {
                   score = scoreFn.applyAsInt(word);
                } catch (RuntimeException ex) {
+                  ex.printStackTrace();
                   // If scoring fails, decide your policy: skip or set 0.
                   // Here: skip row.
                   continue;