:: the other nodes: they are as important as the previous ones in this world. Let's examine them.
(click and drag the atoms)
(double click to release atom)
(1) The FOE is a close relative of the FO molecule,
introduced in chemlambda v2.
(2) The Arrow has a fleeting existence,
unless we choose to not use COMB for "bubbles"
i.e. for closed strings of Arrow nodes.
(3) FRIN and FROUT cap the free in and out ports.