ORF1ab in sars-cov-2 genome

ORF1ab has a spliting base in 13468, shared by the first and second half of the ORF.

> (21555-266+1)/3

[1] 7096.667

> (21555-266+1)%3

Error: unexpected input in "(21555-266+1)%3"

> (21555-266+1)//3

Error: unexpected '/' in "(21555-266+1)//"

> mod( 21555-266+1,3)

Error in mod(21555 - 266 + 1, 3) : could not find function "mod"

> mod(10,3)

Error in mod(10, 3) : could not find function "mod"

> (21555-266+1) %% 3

[1] 2

> (13468-266+1) %% 3

[1] 0

> (21555-13468+1) %% 3

[1] 0