<PRE><B>Question 372421</B>
T(a, b, c) = (b, c, 0)


(T o T)(a, b, c) = T(b, c, 0) = (c, 0, 0) 


(T o T o T)(a, b, c) = T(b, c, 0) = T(c, 0, 0) = (0,0,0)


Therefore, (T o T o T)(a, b, c) = (0,0,0)</PRE>