καθεῖς,
for καθ᾽ εἷς, one by one, one after antoher, [[ LXX.3Mac.5.34; εἷς καθεῖς NT.Mark.14.19, etc.: formed backwards from the _neuter_ ἓν καθέν, noted by 2nd c.AD: Lucianus Sophista “Sol.” 9. ] LXX+NT+2nd c.AD+]
one by one, one after anther
καθεῖς,
for καθ᾽ εἷς, one by one, one after antoher, [[ LXX.3Mac.5.34; εἷς καθεῖς NT.Mark.14.19, etc.: formed backwards from the _neuter_ ἓν καθέν, noted by 2nd c.AD: Lucianus Sophista “Sol.” 9. ] LXX+NT+2nd c.AD+]