This needs better instructions for the expected syntax. With nodes a and b, I tried "a -> b", "a to b", and "a hates b". Each complained "{"detail":"AttributeE

This needs better instructions for the expected syntax. With nodes a and b, I tried "a -> b", "a to b", and "a hates b". Each complained "{"detail":"AttributeError(\"'str' object has no attribute 'copy'\")","error":"PERM_SRV_ERR"}"