My tip
If there are many providers in poi folder (Here,TomTom,Local)
In map display we have many icons for pois example gas stations, it looks like this

muxt0y

add to sys.txt

Code:
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and the result is this

izt3lc

It works on wince device Primo 9.6.5.306142, its not working on Primo Android (if someone knows the tip for Android let us know)