There was no error until clove put 1011 1001 0011, Mine was correct, the one after it was correct, so it is
Before mine 1011 1000 1111
Mine 1011 1001 0000 (it is correct, i've had EIET for 4 years)
next one 1011 1001 0001 (last 4 digits are = decimal 1)
clove 1011 1001 0010 (last 4 digits are = decimal 2)
Trust me you need to have 0000 just like you have 10 in decimal right.
So we will just keep going to avoid confusion, and go with the next one
we are on ---->1011 1001 0111 (Ignoring that we skipped 0 for at least 2 times now)
I've checked all the figures and converted them from binary to decimal from memory or easily calculating the addition in my head. After all there are only 16 values that run from 0 to 15. (zero counts as a value)
I hope I've helped someone.
Here is a self help table if you wonder what to do...
0000 (00 decimal)
0001 (01 decimal)
0010 (02 decimal)
0011 (03 decimal)
0100 (04 decimal)
0101 (05 decimal)
0110 (06 decimal)
0111 (07 decimal)
1000 (08 decimal)
1001 (09 decimal)
1010 (10 decimal)
1011 (11 decimal)
1100 (12 decimal)
1101 (13 decimal)
1110 (14 decimal)
1111 (15 decimal)