a) All perceivable implies same; each ones perception implies difference...others suggest likeness to distract from that.

b) Coincidence suggests "being identical in nature"; which tempts one to ignore that essence (being) is differentiated from one another within the same nature.

c) Equador aka "to make equal" aka e pluribus unum (out of many; one) aka tikkun olam (healing the world by bringing together) aka abrahamism (father of multitude) aka equalizing (equality) differences (diversity) etc.

d) Mesopotamia aka mesos (middle) potamos (river) aka being at middle (life) of river (inception towards death) aka different matter at the middle of the same motion.