CF Pumping Theorem 57. 2 a,b,c), L w I scs, where s e . As examples, aca e L; babcbab e L; CFLs. aa L. acb L Complete the proof below that shows L 1. Let Ln Ln abca b 2. If L e CFLs then Ln e CFLS because 3. Use the CF pumping theorem to show that Ln CFLS 3.a Let w akbkcatbk . L CFL because for all possible values of v and y, it is possible to pump w to generate w'Ln . L CFLs because