https://raw.githubusercontent.com/bavla/cluRC/master/SomeTyW.net
dmin = D(b,d) = 1; C1 = { b, d }
dmin = D(g,j) = 2; C2 = { g, j }
dmin = D(C1,f) = 2; C3 = C1 ∪ { f }
dmin = D(h,i) = 3; C4 = { h, i }
dmin = D(C4,C2) = 4; C5 = C4 ∪ C2
dmin = D(C5,e) = 4; C6 = C5 ∪ { e }
dmin = D(C3,a) = 5; C7 = C3 ∪ { a }
dmin = D(C6,c) = 5; C8 = C6 ∪ { c }
dmin = D(C7,C8) = 8; C9 = C7 ∪ C8