Sample text for demonstrating loops and subsitution patterns
@IF ($Complex)
 don't print this line
  @FOREACH $Col (7,11)
don't print generated line:  \Col  <<<
    @IF ($Col != 11)
don't print ---------------------
    @ENDIF
  @ENDFOR
@ENDIF
numbers 0: @@2*$Complex@@  and  3: @@3*$Real@@ on this line
@IF ($Real)
 print this line

@FOREACH $Line (1,2,3)
  @FOREACH $Col (7,11)
    @IF ($Col != 11)
---------------------
    @ENDIF
generated line: \Line column: \Col position @@($Line-1)*80+$Col@@ <<<
  @ENDFOR
@ENDFOR
@ENDIF

last line