foo.c: In function 'main':
foo.c:8:23: warning: unused variable 'b' [-Wunused-variable]
    8 |         int n,m,k,j,l,b,pd=1,o=0;
      |                       ^
foo.c:8:21: warning: unused variable 'l' [-Wunused-variable]
    8 |         int n,m,k,j,l,b,pd=1,o=0;
      |                     ^
foo.c:8:19: warning: unused variable 'j' [-Wunused-variable]
    8 |         int n,m,k,j,l,b,pd=1,o=0;
      |                   ^

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