**Problem**

Determine .

Given graphs and , let denote the minimum number of edges in a subgraph of such that the edges of can be added to , one edge at a time, so that each edge completes a copy of when it is added.

Of course, if one can solve the problem above, then a natural next step is to determine for all and .

Morrison, Noel and Scott [MNS] solved the related problem of determining for all and .

## Bibliography

[MNS] N. Morrison, J. A. Noel, A. Scott. Saturation in the hypercube and bootstrap percolation. To appear in Combin. Probab. Comput.

* indicates original appearance(s) of problem.