-- result: grouped 2 pkts, advanced 2 pkts <- odd/even switch
-- result: grouped 122 pkts, advanced 126 pkts
-- result: grouped 122 pkts, advanced 128 pkts
-- result: grouped 122 pkts, advanced 128 pkts
-- result: grouped 120 pkts, advanced 128 pkts
-- result: grouped 126 pkts, advanced 128 pkts
-- result: grouped 128 pkts, advanced 128 pkts
-- result: grouped 120 pkts, advanced 128 pkts
-- result: grouped 117 pkts, advanced 128 pkts
-- result: grouped 127 pkts, advanced 128 pkts
-- result: grouped 127 pkts, advanced 128 pkts
-- result: grouped 119 pkts, advanced 128 pkts
-- result: grouped 120 pkts, advanced 128 pkts
-- result: grouped 127 pkts, advanced 128 pkts
-- result: grouped 120 pkts, advanced 128 pkts
-- result: grouped 122 pkts, advanced 128 pkts
-- result: grouped 113 pkts, advanced 128 pkts
-- result: grouped 128 pkts, advanced 128 pkts
-- result: grouped 119 pkts, advanced 128 pkts
-- result: grouped 123 pkts, advanced 128 pkts
-- result: grouped 118 pkts, advanced 128 pkts