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.

* Stock up 150 pct since resuming trade in June * Accounted for 45 pct of Dubai's June trading volume * Follows last year's bubble in Arabtec shares * Shows institutions still not influencing trade * Dubai more modestly valued than during Arabtec debacle By Olzhas Auyezov DUBAI, July 23 (Reuters) - A surge in shares of Amlak Finance since they returned to Dubai's stock market last month has raised concerns about a new wave of unbridled speculation on one of the region's biggest exchanges.

Answer: headquarters_location: Arabtec, Dubai