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Choose the languages that is not valid. 1) L1 = {c|c is a string over {a,b},|c|>1 and |c| <5} 2) L2 = {a|a is a
Choose the languages that is not valid.
1) L1 = {c|c is a string over {a,b},|c|>1 and |c| <5}
2) L2 = {a|a is a string over {0,1}, a =bc, |a|>0,|b| 0, |c| < |b|}
3) L3 = {w|w = 0n1m,n 4) L4 = {w|w = 0n1m,n 5) L5 = {w|w = (01)n,n>1} 6) L6 = {w|w = (01)n,n>1} 7) L7 = {d|d is a string over {x,y}, |d|==5}
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