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subroutine pvswap(q1,q2,m1s,m2s)
implicit none
include 'lib/TensorReduction/Include/types.f'
real(dp)::q1(4),q2(4),qtemp(4),m1s,m2s,mtemps
integer nu
do nu=1,4
qtemp(nu)=q1(nu)
q1(nu)=q2(nu)
q2(nu)=qtemp(nu)
enddo
mtemps=m1s
m1s=m2s
m2s=mtemps
return
end