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#FileOne.pl
package ProgramSpread;
...
    }
return 1;
END{}

#FileTwo.pl
package ProgramSpread;  #The same package above
...
            }
return 1;
END{}

#using the package
require "FileOne.pl";   #File names containing the package
...

ProgramSpread::subroutine1();
ProgramSpread::subroutine2();