2.5.4 Concatenation Operators
The concatenation operators combine two strings to form one, by
appending the seond string to the right side of the first. The
Rexx concatenation operators are:

     (blank)        Concatenation of strings with one space
between them.
     (abuttal) Concatenation of strings with no intervening space.
     ||        Concatenation of strings with no intervening soace.

Examples:
     a = abc;b = ‘def’
     Say a b             -> results in ‘abc def’
     Say a || b          -> results in ‘abcdef’
     Say a’xyz’          -> results in ‘abcxyz’


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