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      program  xishu

     implicit none

     real(8)       :: t=1.0   

     integer       :: i1,ny

     real(8),allocatable  :: h(:,: )

     ny=8  

     allocate(h(ny,ny))

     h=0.0

     do i1=1,ny-1

     h(i1,i1+1)=t

     h(i1+1,i1)=t

     enddo

     h(1,ny)=t

     h(ny,1)=t

     end

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