the first signed in pencil, dated 1984 and numbered 54/144 (lower right); the second signed in pencil and dated 1988 (on the verso of one sheet); titled Second Quartet and numbered 10/15 (on the verso of each sheet), Executed in 1984 and 1988; the first from the edition of 144 plus 18 artist's proofs; the second from the edition of 15 plus ten artist's proofs
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