< 0 c.zadd("src1", [[32.0, "a"], [64.0, “b”]]) c.expire("src1", 60) end if c.ttl(“src2”) < 0 c.zadd("src2", [[44.0, "a"], [21.0, "c"]]) c.expire("src2", 60) end c.zinterstore("dest", ["src1", "src2"]) c.expire("dest", 10) c.zrevrange("dest", 0, 5) #=> [“a"] dest = src1 ∩ src2