Before WWII the US Navy a special type of Morse Code flags that used the three colours to represent Morse Code. Red was the DIT, Yellow was the DAH, and blue was the Repeater-Sub that depended on the preceding colour towards the hoist.
Thus using this old US Navy Code a Morse Code Error flag can be represented. It has eight stripes for the eight DITS of the Error Message. Since it is only uses DITS red and blue are used.
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