\set ECHO none
remove_provenance

(1 row)
city|formula
Berlin|(Ellen ⊕ Susan) ⊖ (Ellen ⊗ Susan)
New York|(John ⊕ Paul) ⊖ (John ⊗ Paul)
Paris|(Dave ⊕ Magdalen ⊕ Nancy) ⊖ ((Dave ⊗ Magdalen) ⊕ (Dave ⊗ Nancy) ⊕ (Magdalen ⊗ Nancy))
(3 rows)
remove_provenance

(1 row)
city|formula
(0 rows)