test31 = putTree1 {_} {_} {@$\mathbb{N}$@} {@$\mathbb{N}$@} (createEmptyRedBlackTree@$\mathbb{N}$@ @$\mathbb{N}$@ ) 1 1
  $ \t @$\rightarrow$@ putTree1 t 2 2
  $ \t @$\rightarrow$@ putTree1 t 3 3
  $ \t @$\rightarrow$@ putTree1 t 4 4
  $ \t @$\rightarrow$@ getRedBlackTree t 4
  $ \t x @$\rightarrow$@ x

-- Just
-- (record
-- { key = 4
-- ; value = 4
-- ; right = Nothing
-- ; left = Nothing
-- ; color = Red
-- })