Compiler : LL(k) and LR(k) grammer

Question

Can  LL(k) and LR(k) gammer has null and unit productions?

Comments

Null production is not possible  , but unit may be there.

take S-> A , A-> a

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null production are also allowed..

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yes. agree. i.e. when grammar is containing left recusion then we put null , to make ll(1)

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do we need to eliminate left recursion and left factoring to make them LL(1) or LR(1) ??