μοχθεῖν τε βροτοῖσ(ιν) άνάγκη → and you mortals must endure trouble (Euripides' Hippolytus 208)
putting together: P. and V. σύνθεσις, ἡ.
mixing: P. and V. κρᾶσις, ἡ.
political association: P. ἑταιρεία, ἡ, σύστασις, ἡ, Ar. and P. σύνοδος, ἡ.