A :[0.0 1.0 0.0 2.0; 0.0 1.0 0.0 3.0; 0.0 0.0 2.0 0.0]
C :Fiber(Dense{Int64}(SparseList{Int64, Int64}(Element{Inf, Float64}([1.0, 1.0, 2.0, 2.0, 3.0]), 3, [1, 1, 3, 4, 6], [1, 2, 3, 1, 2]), 4))
redefault!(B, Inf) :Fiber(Dense{Int64}(SparseList{Int64, Int64}(Element{Inf, Float64}([1.0, 1.0, 2.0, 2.0, 3.0]), 3, [1, 1, 3, 4, 6], [1, 2, 3, 1, 2]), 4))
Fiber(Dense{Int64}(SparseList{Int64, Int64}(Element{Inf, Float64}([1.0, 1.0, 2.0, 2.0, 3.0]), 3, [1, 1, 3, 4, 6], [1, 2, 3, 1, 2]), 4))
Fiber(Dense{Int64}(SparseList{Int64, Int64}(Element{Inf, Float64}([1.0, 1.0, 2.0, 2.0, 3.0]), 3, [1, 1, 3, 4, 6], [1, 2, 3, 1, 2]), 4))

