4.1 Top-down Parsing with Backtracking
 4.2 Predictive Parsing and LL(1) Grammars
 4.3 Recursive Descent Parsing
 4.4 LL(1) Parsers
 4.5 Determining Lookahead Symbols
 4.6 Algorithms for the FIRST and FOLLOW Functions
 4.7 LL(k) Grammars