Schedule Scanner and Parser Grammer's: S -> ɛ; S -> FREE; S -> A; B -> & A; B -> ɛ; A -> E { T } B; E -> SUN; E -> MON; E -> THU; E -> WED; E -> THR; E -> FRI; E -> SAT; D -> & T; D -> ɛ; T -> N ~ N D; N -> 8; N -> 9; N -> 10; N -> 11; N -> 12; N -> 13; N -> 14; N -> 15; N -> 16; N -> 17; N -> 18; N -> 19; N -> 20;