Seven-eleven is a reaction where a fishhook and elevener (or larger variants) swap places when a block or block-like front touches it. If attached to an oscillator or catalyst that produces this front, they can swap repeatedly. Matthias Merzenich originally discovered the reaction on December 16, 2015 in 35P12.1; the reaction has since been used in other oscillators such as 76P86 and a specific p60 lumps of muck hassler.
The name comes from the two components having seven cells and eleven cells and 7-Eleven being a convenience store chain based in the united states.
