[ Object ] respond: [ String ] and: [ String ] and: [ String ]

☞ x ≔ Object new.
 x on: ‘respond:and:and:’  do: { :a :b :c ↲ (a + b + c).
 }.
 ✎ write: (x abc: ‘def’ ghi: ‘jkl’), stop.

abc:ghi:defjkl