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Bitcoin August 22, 2017

Confused by the term: trading partners. And how to convert more fringe currencies back to bitcoin

Two questions:

I am confused by the term: trading partners like BTC/ETH, etc.
I’m into some more of the fringe currencies, IOTA, and SAN. Bought them with Bitcoin on bitfinex, how to convert back? Seems to be a one-way street. Am I stuck?