Before revision: In Linguistics, specifically in Generative Syntax, the Final-Over-Final Constraint (FOFC) is a proposed constraint that bans head-final projections that immediately dominate head-initial projections, in word-order variation in natural language concerning the hierarchical structure seen in Extended Projections, which asserts that a Head-Final phrase cannot immediately dominate a Head-Initial phrase if they are in the same extended projection.
After revision: In Linguistics, specifically in Generative Syntax, the Final-over-Final Constraint (FOFC) is a proposed constraint in word-order variation in natural language concerning the hierarchical structure seen in Extended Projections, which asserts that a Head-Final phrase cannot immediately dominate a Head-Initial phrase if they are in the same extended projection.