x = 1;

y = 3;

z = 5;

def sub1():

a = 7;

y = 9;

z = 11;

def sub2():

global x;

a = 13;

x = 15;

w = 17;

def sub22():

nonlocal a;

a = 19;

b = 21;

z = 23;

B) List all the variables, along with the program units where they are declared, that are visible in the body of sub22 assuming the following dynamic scoping is used with the following calling seqencue: sub1 >> sub22.