The minus is a concatenation operator for 2 strings, but, it is different of the plus operator because it removes all trailing blank spaces from the first operand and put them back at the end of the result, thus the lenght of the result is the same as the sum of the to operands, I better leave english explanations and put code examples :)
cText1 = 'Text1' + space(5)
cText2 = 'Text2'
cText1 + cText2 -> 'Text1 Text2'
cText1 + cText2 -> 'Text1Text2 '
"The five senses obstruct or deform the apprehension of reality."
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"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
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