The Alphabet of the Order Book: 6,561 Possible States, 333 Real Bitcoin / TetherUSBINANCE:BTCUSDTMarketFlowResearchWe described the order book as a single word: eight features, three states each. Of the 6,561 words that could exist, only 333 ever occur — and when we tested that alphabet out of sample, it described the market well and predicted it poorly. · 6,561 combinations are possible — only 333 ever happen. · All-quiet covers ~51% of windows and moves the least. · The busiest active state moves ×1.5 more — but its up-share is 48%. Six coins, per-second order-book data. Research, not financial advice. Charts and analysis produced with AI assistance, human-reviewed.