Because https://github.com/johniak/word-clock/blob/ea15b364374213c0eb13bf50f3ac40784b4ba7ba/raspberry-pi/src/wordclock/word_clock.py#L71 sets the variable `all_highlighted_words` then https://github.com/johniak/word-clock/blob/ea15b364374213c0eb13bf50f3ac40784b4ba7ba/raspberry-pi/src/wordclock/word_clock.py#L75 should probably be **+=** and not just **=**.
Because
word-clock/raspberry-pi/src/wordclock/word_clock.py
Line 71 in ea15b36
sets the variable
all_highlighted_wordsthenword-clock/raspberry-pi/src/wordclock/word_clock.py
Line 75 in ea15b36
should probably be += and not just =.