Logical Operations
     Logical Operations evaluate to either .TRUE.   or   .FALSE.
     Logical Operators
                          .AND.                         .OR.                        .NOT.
         Example :    
   .FALSE..OR..NOT..TRUE..AND..TRUE.                   
              Relational  Operators
    -     The values of arithmetic expressions can be compared using
          relational operators
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    -    The result of a relational operation is    .TRUE.   or   .FALSE.
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               Relational Operators :
                             .EQ.         .NE.         .GT.        .GE.        .LT.         .LE.
              Examples :
                              X .EQ. Y
                                       Z + A .GT. X