-- -*- M2-comint -*- hash: 1731184636747994565

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

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

o1 : Matroid

i2 : circuits M

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

o2 : List

i3 : 
