x = 22, y = 10, rule = B34/S34
bo17bo$bobo15bobo$bo17bo$bbo17bo$o3bobobobobobobobobo$o3bobobobobobobo
bobo$bbo17bo$bo17bo$bobo15bobo$bo17bo!
A period 2 oscillator that can be extended.
If one of the dominoes is removed, the row of dominoes decays and the
period 2 terminating components turn into similar looking period 6 oscillators.
David I. Bell, February 1994
