Switch the order of two letters.
Close up a space between letters.
Delete a letter.
Switching the order of two letters: "stwich"
Closing up a space between letters: "Clsoup"
Deleting a letter: "Deete"
Close up a space between letters.
Delete a letter.
Closing up a space between letters: "Clsoup"
Deleting a letter: "Deete"