refactory
predicate parser: null, first, follow, parser tables all done
top-down parser: LL1Parser done
add cool.cup
still 10 point
14 point
still 14 point
15 point
still 15 point
still 15 point
still 15 point
still 15 point
still 15 point
23 point
29 point
34 point
43 point
53 point
61 point
65 point