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If you start a cell with %html or %md then the input is hidden after you evaluate the cell. To toggle display of the input, double click on the output.

In general, you can always double click on the output to toggle display of the input. Alternatively, you can select a range of cells and click the button at the top labeled "in".

I plan to add an additional button in the output that does the same thing as double clicking. This will unfortunately clutter the interface a lot, so I've hesitated so far.