Fixing The LeWitt 4×4 Set Comprehension

I got the LeWitt set comprehensions wrong. I’ve fixed the others (I edited this blog without declaring it, I feel unclean…) but the 4 line, 4 colour one was a bit harder. Here’s a sketch for the fixed version.C = {r,y,b,k}L = {|, \, /, -}V = C x L = {(r, |), … (k, -)}W = PV = {{(r, |)}, .. {(r, |), … (k, -)}}X = {x :∈ W | #x > 0 ^ #x < 5} % All sets of 1..4Y = {x :∈ X | #x = # U (U x) } % All sets with unique first pair itemsZ = {x :∈ Y, y :∈ x • U (U y)} % Each item of each member set combinedAlternative Z:Z = {x :∈ Y • U (U x)} % Each member set combined

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