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(Corresponds to Section 3.5 of ANSI X3.9-1978 FORTRAN 77.)
Generally, DATA statements may precede executable statements.
However, specification statements pertaining to any entities
initialized by a DATA statement must precede that DATA
statement.
For example,
after `DATA I/1/', `INTEGER I' is not permitted, but
`INTEGER J' is permitted.
The last line of a program unit may be an END statement,
or may be:
END PROGRAM statement, if the program unit is a main program.
END SUBROUTINE statement, if the program unit is a subroutine.
END FUNCTION statement, if the program unit is a function.
END BLOCK DATA statement, if the program unit is a block data.