String

   The operator with the highest precedence in an expression is
   evaluated first. Following this, the next highest operator
   precedence is evaluated, and so on. Operators with the same
   precedence are evaluated from left to right, as they appear in
   the expression.

      Operator Precedence Description

      +        5         String concatenation
      -        5         String reduction
      .EQS.    4         String equal
      .GES.    4         String greater than or equal
      .GTS.    4         String greater than
      .LES.    4         String less than or equal
      .LTS.    4         String less than
      .NES.    4         String not equal