Which area would show all possible combinations of vegetables and fish consumption that would make both Aidan and Biden better off compared to their initial endowment (labelled W)

Vy 4 Biden Vegetables Fy Wb Fish Ux4 6 Fish Uy4 Wa UX3 Uy3 Ux2 UV1 Uy2 FX Ox Vegetables Aiden Vx