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     FORTRAN warning error F4801
 
     label <number> : used across blocks
 
     An executable statement label was referenced across a statement
     block. This situation may arise in the following cases:
 
          ■ When a GOTO statement uses a statement label in a
            different arm of an IF...ELSE...ENDIF statement
 
          ■ When the program jumps into a DO loop
                                    -♦-