Given phrases that describe the relationship between two words/phrases as options, extract the word/phrase pair and the corresponding lexical relationship between them from the input text. The output format should be "relation1: word1, word2; relation2: word3, word4". Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

The commodity rout is also putting pressure on stronger coal companies, which have weathered a difficult time for the sector in the last two years that forced smaller companies, such as Walter Energy Inc, into bankruptcy protection and more are expected to follow.

Answer: product_or_material_produced: Walter Energy, coal