function add/3
  \add(\1 \add(\2 \3))
end function

# (function (@ 1 0-8) ‘add/3’
#   (.inner
#     (map (@ 2 2-2)
#       (.sequence
#         (keys (@ 2 2-22) ‘\add(\1 \add(\2 \3))’)
#       )
#       (.result nil)
#     )
#   )
# )