-- -*- M2-comint -*- hash: 1731184635501188318

i1 : M = matroid({a,b,c,d},{{a,b},{a,c}})

o1 = a "matroid" of rank 2 on 4 elements

o1 : Matroid

i2 : hyperplanes M

o2 = {set {1, 2, 3}, set {0, 3}}

o2 : List

i3 : 
