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three modules are monodirectionally (i'm not sure if this is a word)
associated by USE statements i.e.

MODULE A
...
contains
SUBROUTINE mod_a_1 ( )
..
END SUBROUTINE mod_a_1
...
END MODULE A


MODULE B_1
use A
...
END MODULE B_1

MODULE B_2
use A
...
END MODULE B_2


MODULE C
use B_1
use B_2
...
END MODULE C



what are the implications if B_1 and B_2 use subsets of A via the ONLY
keyword.

??


Thanks in advance,

Colin.