I am having trouble understanding the reference sequence for sars-cov-2, NC_045512.2
Three nucleotides equals one amino acid, right? But the nucleotide at position 13468 seems to be used twice, so the sequence starting at 13463 reads:
tta aac ggg ttt ... which translates to LNGF
However, according to the reference, the translation is LNRV, so it's read as tta aac cgg gtt etc - like the c is repeated.
The reference says "join(266..13468,13468..21555)" but how does this work and why?