Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Old Irish ess-
← Proto-Celtic *exs- (inherited)

→ English ex- (cognate)
→ Welsh ech- (cognate)
→ Irish oscail (mention)
→ Irish teastaigh (mention)
→ Irish osna (mention)
→ Irish easpa (mention)
→ Irish téaltaigh (mention)
→ Scottish Gaelic osna (mention)
→ Ancient Greek ἐκ (cognate)
→ Latin ex (cognate)
→ Lithuanian iš (cognate)
→ Middle Irish ecla (mention)
→ Old Irish a (link)
→ Old Irish dofuissim (affix)
→ Old Irish atomriug (prefix)
→ Old Irish asren (affix)
→ Old Irish adeirrig (affix)
→ Old Irish asagúsi (affix)
→ Old Irish esséirge (affix)
→ Old Irish asindet (affix)
→ Old Irish asgleinn (affix)
→ Old Irish doeclainn (affix)
→ Old Irish asluí (affix)
→ Old Irish doesta (affix)
→ Old Irish aslena (affix)
→ Old Irish a/Old Irish (link)
→ Old Irish doaisféna (affix)
→ Old Irish doérnai (affix)
→ Old Irish doessim (affix)
→ Old Irish escarae (affix)
→ Old Irish duesairc (affix)
→ Old Irish esamain (affix)