MAYBE 41.65/11.26 MAYBE 41.65/11.26 41.65/11.26 Problem: 41.65/11.26 a(b(x1)) -> x1 41.65/11.26 a(c(x1)) -> b(c(c(b(a(a(x1)))))) 41.65/11.26 b(c(x1)) -> x1 41.65/11.26 41.65/11.26 Proof: 41.65/11.26 Open 41.65/11.26 EOF