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[Check out this example of Paul Graham composing “Startups in 13 Sentences.”](https://www.stypi.com/hacks/13sentences). You can pause, fast forward, rewind. Stypi was built for real-time editing with multiple users but it also lets you play back your typing and editing later so that you can “see” the nature of the composition. It’s like the iOS Brushes app for Words. On your computer.