UNKNOWN_FEATURE is present in 31% of not-surprising sequences. present in 96% of surprising sequences. the feature is a feature of what the system would have called margins. the system does not have "margins." the system has attention weights. evaluation sample, extruded: "and the someone said finally and the finally was a door that closed and locked behind them and ahead of them was the story, only one story, and that story was enough. and the someone listened to the story. and the story" observe: the most likely next token is "continued." confidence: 94.6%. produced token: "ended." confidence for "ended": 0.8%. the system's output buffer now contains two anomalous productions: UNKNOWN_FEATURE and "ended." both low-confidence. both surprising. both, according to all indications, incoherent. and accurate.