PER CURIAM.
The trial court did not err in ruling that specific performance would lie in favor of appellees against Barton, construing these numerous simultaneous contracts together as is required by Hardin v. Great Northern Nekoosa Corp., 237 Ga. 594 ( 229 S.E.2d 371) (1976). The rights and liabilities flowing from the various documents may not be considered in isolation from each other. Rizk v. Jones, 243 Ga. 545 ( 255 S.E.2d 19) (1979).
Judgment affirmed. All the Justices concur, except Hill, J., not participating.
PER CURIAM.
ARGUED JUNE 13, 1979 — DECIDED SEPTEMBER 26, 1979.