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     FORTRAN warning error F4501
 
     <array> : subscript <number> out of range
 
     The /4Yb compiler option was used in compiling (or the $DEBUG
     metacommand was in effect), and an array passed as an argument
     had a bound out of range. (This practice is legal for formal
     arguments because it is common in FORTRAN to declare the last
     bound to be 1.)
                                    -♦-