threesquares(8)
True

threesquares(191)
False

threesquares(1001)
True

threesquares(199)
False

hillvalley([5,3,2,1,2,3,5,4,3,2,1])
False

hillvalley([1,2])
False

hillvalley([])
False

hillvalley([5,4,3,2,1,0,-3,-2,-1])
True

shuffle([100,200,300],[])
[100, 200, 300]

shuffle([],[10,20,30])
[10, 20, 30]

shuffle([[1],2,[3]],[[4,[5]],6])
[[1], [4, [5]], 2, 6, [3]]

shuffle([[1,2,3]],[[4,5,6]])
[[1, 2, 3], [4, 5, 6]]

shuffle([[[1,2,3]]],[[4,5,6]])
[[[1, 2, 3]], [4, 5, 6]]

duplicates([71,22,57,22,71,99])
[71, 22]

duplicates([30,20,10,10,20,30])
[30, 20, 10]

duplicates([301,201,101,101,301,201])
[301, 201, 101]

duplicates([[301],201,301,[201]])
[]

duplicates(["[301]",[201],201,"301","[201]",301,201])
[201]

splitwith([22,75,"hello",11,[51],"hello",9,[51]],[51])
[[22, 75, 'hello', 11], ['hello', 9], []]

splitwith([7,"2",5,7,7,["2",7],9],"2")
[[7], [5, 7, 7, ['2', 7], 9]]

splitwith([71,2,5,7,[2,7],9],83)
[[71, 2, 5, 7, [2, 7], 9]]

splitwith([7,2,[],8,[8],[],[[],7],2,9],[])
[[7, 2], [8, [8]], [[[], 7], 2, 9]]

splitwith([11,22,11,11,22,11],11)
[[], [22], [], [22], []]