 chan x], or [:close chan], where a :give tuple is the result of a write and a :take tuple is the result of a read. Each clause must be either a channel (for a channel take operation) or a tuple [channel x] (for a channel give operation). Operations are tried in order such that earlier clauses take precedence over later clauses. Both give and take operations can return a [:close chan] tuple, which indicates that the specified channel was closed while waiting, or that the channel was already closed.</pre><a 