Specifically seeking an answer to question (b) and illustration of the graph - no other answers

Choose a capital-abundant advanced country and a labour-abundant developing country, then select a capital-intensive good and a labour-intensive good. Given the assumptions of the Hechscher-Ohlin model, provides answers to following short problems.

(a) Graphically demonstrate the pre-trade positions of both counties on their PPFs, and show that potential for trade exists between the two nations.

(b) With the opening of trade, in what commodity does each nation specialise and why? Demonstrate your answer on the graph - seeking an example of this graph.

Please explain briefly.