4 | | + pure (\u1 -> (\u2 -> (\u3 -> u1 : u2 Term)))
10 | | | | | + pure (\u1 -> (\u2 -> (\u3 -> (\u4 -> 'a' : ('b' : ('c' : ('d' : Term)))))))
11 | | | | | ` def <hidden>
13 | | | | ` ref <hidden>
19 | | | + pure (\u1 -> (\u2 -> (\u3 -> u1 : u2 u3)))