the book is "First Course on Fuzzy Theory and Applications" 3.10 There is a relation R123. R123 X x X2 X3 = 0.9 / (x, a, a) +0.4/(x, b, a) +1.07(y, a, a) + 0.77 (y, a, B) R123 X1 + X2 X; where X1 = {x,y}, X2 = {a,b}, X3 = {a,b} a) Determine R12 CX x X, and R23 X x X2 by projection. b) Obtain R123 by cylindrical extension of R12 and R23. c) Obtain R 1234 CX, X, X3 Xd by cylindrical extension where X4 = {p,q)