-- -*- M2-comint -*- hash: 1731961010933323763

i1 : isPlanar graph {{0,1}, {1,2}, {2,3}, {3,4}, {0,4}}

o1 = true

i2 : isPlanar graph flatten for i from 0 to 4 list for j from i+1 to 4 list {i,j}

o2 = false

i3 : 
