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A = rand(rows=61, cols=33)
B = rand(rows=33, cols=23)
C = rand(rows=43, cols=12)
D = rand(rows=12, cols=23)
E = rand(rows=43, cols=3)

# A %*% (B %*% t( (t(E) %*% C) %*% D )) -> optimal plan

R = A %*% B %*% t(C %*% D) %*% E

write(R, $1)



