(V,E) = ({a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p},{{a,c},{a,g},{a,n},{b,g},{b,j},{b,o},{c,h},{c,n},{d,i},{d,m},{d,n},{e,n},{e,o},{f,h},{f,n},{f,o},{g,i},{g,l},{g,o},{h,o},{i,j},{j,l},{k,m},{k,p},{l,n},{m,p},{n,p}})