for last door i had to check WT, actully i checked almost everything, 1 3 5 6 i tho it means first numer 3rd... i got => 7874
then i tho it might be 7+1 , 4+3 , 8+5=13=3(mod10) , 2+6
but after i checkd WT it turns out that it is 7-1 , 4-3, 8-5, 2-6=-4=6(mod10)
but dear devs, dont u think its too much ?
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