W-0026

A superpermutation on 12 symbols, found by Jay Pantone jaypantone. It beat the previous record, W-0019, by 157,188 letters, and was the record for n = 12 on Sep 29, 2026, when W-0030 was 4,380 letters shorter.

Length: 522,752,900
Repeated occurrences: 169,344
Announced: Sep 29, 2026

Begins

0123456789AB0123456789A0B123456789A01B23456789A012B3456789A0123B456789A01234B56789A012345B6789A0123456B789A01234567B89A0…

Windows

	522,752,889	windows of 12 consecutive letters
=	479,001,600	distinct permutations, all 12! of them
+	169,344	repeated occurrences of a permutation
+	43,581,945	windows that are not permutations

How it was found

The 43/80 construction at 12 symbols, with cuts and order optimized by computer search; in the repository's first commit.

Checking

Program	Source	Result	Time
permcheck	c46d3654	all 479,001,600 permutations appear	31 s
literal_check	f4687121	agrees on coverage	1 min 15 s

SHA-256d9057b3a6b88698bb56e3d6a9d700531b67cf91a89d1293b78a3efbc97208532 Compilerg++ (Debian 14.2.0-19) 14.2.0

Download

Download Detour (.detour) 44.7 kB, or 522.8 MB decoded

Decode to text

# check it yourself
detour decode W-0026.detour - | tr -d '\n' | shasum -a 256
tar xzf checkers-rs-source.tar.gz && cd checkers-rs && cargo build --release --locked
./target/release/classcheck 12 ../W-0026.detour 522752900
./target/release/bitmapcheck 12 ../W-0026.detour 522752900
./target/release/wordhash 12 ../W-0026.detour 522752900

Decoding needs detour; see the Detour format for how to build and install it. The checkers are in checkers-rs-source.tar.gz, which needs Rust 1.89 or later; each one decodes the file itself, so the word is never written out.

The file's header gives n = 12 and sync exponent 0. The file has 4,904,644 tokens: 1 START, 1 literal of 1 byte in all, and 4,904,642 deviations. Deviations by weight, from 1 to 12: 169,344 · 1,354,752 · 3,378,310 · 27 · 4 · 27 · 298 · 571 · 748 · 452 · 98 · 11.