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module  aaa1
implicit none
contains

subroutine aaa(a,b,c)
real a,b
real,optional:: c
b=a
c=2.
end subroutine aaa
end module aaa1

program main
use aaa1
implicit none
real a,b
a=1.
call aaa(a,b)
write(*,*) a,b
end
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