please answer the following

in process$\_$lines$(),$ a loop will run one time for each pair of DNA strings stored in a list of strings as follows:

A more typical loop would use a counter that directly corresponds to a list index, the first time through the loop, the first item in the list would be processed. But, this loop should ignore the first item $($count$)$ and process two items instead of one. The first pass of the loop should process indexes $1$ and $2,$ next loop $3$ and $4,$ as shown in the table below. Look for the pattern and determine the math that will start with the loop counter and determine the appropriate index.

$\backslash$table$[[$Counter$,$index $1,$index $1$ math,index $2,$index $2$ math$],[0,1,,],[,,],[2,3,,],[2,5,,,]]$