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Click the green plus / minus sign
Click the grey symbol.
Type what you want then press Tab or Enter on your keyboard.
Click the cross.
Shift - or control-click each item in turn, then press delete on your keyboard.
Click to the right of the item, then press backspace to edit the label, and press tab to complete.
Click after the last item, use the left arrow on your keyboard to go back to previous items, then press Delete on your keyboard to delete items after the cursor.