'hihi' or 'hi hi' is another, fairly rare, written variant that is used as laughter in morse code, and has migrated to written text by people that commonly use

'hihi' or 'hi hi' is another, fairly rare, written variant that is used as laughter in morse code, and has migrated to written text by people that commonly use morse code. I'm not sure the exact reason, but it does make all the letter dits. 'ha' is spelled .... .-, but 'hi' is spelled .... ..