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This accepts the chosen letter and advances the cursor to the next position, showing a second "c".
(Thus the default for the next char is always the same as the last char entered.)
By carefully scrolling a very small amount change this "c" into a "d", then press "Next" again. Change the second "d" into a space (the space is located just before lower case "a") and press "Next". Now change the second space into a dot "." which you will find just before the space. Press "Next". This time the second dot is good - we need it. Now press enter (the "Play/Pause" button). -
If you made a mistake, you can erase the last char(s) by pressing the "Previous" button once or several times.