Yes, I read this. First digit is not coded in barcode, but used to encode "left". Coded are digits 2-13 (each 7 bits + 11 bits for sentinels). So, I have 84 bits. Last 6 digits I can decode by lookup in code table for "right". But to know digits 2-7 I need to know first one. I don't have idea how to get it
