7. (CILOS: Turing machines computobinity) What is the function f(x,y) computed by the following Turing machine? Assuming that x and y are positive integer numbers and are on the tape in unary notation (w(x)={1}+ and w(y) {1}+), separated by a single 0, with the read-write head on the leftmost symbol of w(x). 1:1,R 1:1,R 1:1. L B....... 0:1, R 0:0, 1;0, 0:0,R 91 90 92 93 94