{"uid": 1, "once": [1], "twice": 1}
{"uid": 1, "once": [1], "twice": 3}
{"uid": 1, "once": [1], "twice": 5}
{"uid": 1, "once": [3], "twice": 1}
{"uid": 1, "once": [3], "twice": 3}
{"uid": 1, "once": [3], "twice": 5}
{"uid": 1, "once": [5], "twice": 1}
{"uid": 1, "once": [5], "twice": 3}
{"uid": 1, "once": [5], "twice": 5}