An inductee is a pattern which is not a still life, but can exist as an island within a still life. All of its living cells must have 2 or 3 neighbors, and all cells to be born must be on the edge of the pattern (for a certain definition of "edge").
- 3 cells: pre-block (in eg. aircraft carrier)
- 4 cells: t-tetromino, z-tetromino
- 6 cells: table, block and glider, 3 other pre-block combinations (chiral, S2, D1d), z-hexomino
- 7 cells: bookend, bun, side, table with foot (in eg. mathematician), snake siamese preblock
This 7-cell pattern is the simplest single-island S23 pattern that isn't an inductee:
.O... O.O.O .O.OO