Null productions are of the form A -> ϵ.If L is CFL generated by a CFG having Λ-productions, then there is a different CFG that has no Λ-production and still generates either the whole language L (if...

Null productions are of the form A -> ϵ.If L is CFL generated by a CFG having Λ-productions, then there is a different CFG that has no Λ-production and still generates either the whole language L (if L does not include Λ) or else generate the language of all the words in L other than Λ. Remove Λ production from the given CFG

S --> XY
X --> Zb
Y --> bW
Z --> AB
W --> Z
A --> aA | bA | Λ
B --> Ba | Bb | Λ