Make up an ID for a sequence (list) of nodes.
        Note: `getrandbits()` is very uninformative as a "readable" ID. Here, we build a name
        such that when the mouse hovers over the drawn node in Jupyter, one can figure out
        which original nodes make up the sequence. This is actually quite useful.

def sequence_id(self, sequence):
        """Make up an ID for a sequence (list) of nodes.
        Note: `getrandbits()` is very uninformative as a "readable" ID. Here, we build a name
        such that when the mouse hovers over the drawn node in Jupyter, one can figure out
        which original nodes make up the sequence. This is actually quite useful.
        """
        if self.meaningful_ids:
            # TODO: This might fail if the ID becomes too long
            return "><".join([node.id for node in sequence])
        else:
            return getrandbits(64)