A=[1,2,3,4,5]?
B=[1,2,3|B]?
print_depth(0)?
print_depth(1)?
print_depth(2)?
print_depth(3)?
print_depth(4)?
print_depth(5)?
.
print_depth?
C=s(A,t(B))?
print_depth(0)?
print_depth(1)?
print_depth(2)?
.
print_depth?
D=[1,2,3|s(t(u(X)))]?
print_depth(0)?
print_depth(1)?
print_depth(2)?
print_depth(3)?
print_depth(4)?
.
print_depth?
A=s([1,2,3|X:q(qq(qqq))],[a,X|b([c|d(X)])])?
print_depth(0)?
print_depth(1)?
print_depth(2)?
print_depth(3)?
print_depth(4)?
print_depth(5)?
.
print_depth?
A=s(t(u(1),v(2)),w(x(3),y(4)))?
print_depth(0)?
print_depth(1)?
print_depth(2)?
print_depth(3)?
.
print_depth?
A=[s(1)|t(2)]?
print_depth(0)?
print_depth(1)?
print_depth(2)?
.
print_depth?
A=[1,2,3,4]?
print_depth(0)?
print_depth(1)?
print_depth(2)?
print_depth(3)?
print_depth(4)?
.
print_depth?
A=[1]?
print_depth(0)?
print_depth(1)?
.
print_depth?
A=[]?
print_depth(0)?
.
print_depth?
A=[[[1,2,3],[1,2,3],[1,2,3]],
   [[1,2,3],[1,2,3],[1,2,3]],
   [[1,2,3],[1,2,3],[1,2,3]]]?
print_depth(0)?
print_depth(1)?
print_depth(2)?
print_depth(3)?
.
print_depth?
A = [s([1,2,3],[1,2,3],[1,2,3]),
     s([1,2,3],[1,2,3],[1,2,3]),
     s([1,2,3],[1,2,3],[1,2,3])]?
print_depth(0)?
print_depth(1)?
print_depth(2)?
print_depth(3)?
.
print_depth?
A=[s([1,2,3],[1,2,3],[1,2,3]),[1,2,3]|s([1,2,3],[1,2,3],[1,2,3])]?
print_depth(0)?
print_depth(1)?
print_depth(2)?
print_depth(3)?
.
