\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)