Explore 4-bit families such as ?0?0 and ?1?1, remove the primes, and see which surviving numbers form shapes on the 0–1–2 grid using the mapping 00 → 0, 01 → 1, 10 → 2.
Bit pairs are read as ab|cd and plotted as (ab, cd) on the 0–1–2 grid when both pairs are one of 00, 01, or 10.
| Bits | Decimal | Prime? | Survives? | 2-bit split | Grid point | Status |
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