1.   [[[[[[[[[[[[]]]]]]]]]]]]]
 2.   [[[[[[[[[[[[]]]]]]]]]]]]
 3.   [[[[[]],[[]]]]]
 4.   [[[[[()]],[[()]]]]]
 5.   [length [[]],2]
 6.   [1,2]
 7.   [(),(),()]
 8.   [(),((())),()]
 9.   []
10.   drop 3 "cat"
11.   x = 3::Int;    y = 3::Float;    z=[x,y]
12.   x = 3::Int;    y = 3::Float;    z=(x,y)