Tautology A.K.A Truth Tables

                           
    A       A       A
  && T F     || T F     A-glbl
B-locl
T F
B T T F   B T T T   B T T F
F F F   F T F     F F F
                           
return global && local -vs- return global || local -vs- if(!global){
return false
}
return local

 

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