also self-contained glider that leave no structures behind and don't require structure to move are essential in repeating mechanism, since they leave the path i

also self-contained glider that leave no structures behind and don't require structure to move are essential in repeating mechanism, since they leave the path in a known state, i.e. https://copy.sh/life/?gist=f3413564b1fa9c69f2bad4b0400b8090&step=512 https://copy.sh/life/?gist=f3413564b1fa9c69f2bad4b0400b8090&...