Use the following problem statement to answer questions $16-19.$

A company wants to develop a workforce schedule for the staffing requirements in the table below, giving workers two consecutive days off per week. The first preference is given to the $S-$Su pair in case of a tie in the selection of off days. The second preference is given to the earliest pair when a pair is involved in a tie. For example, Su$-$M is earlier than M$-$T because the company considers Sunday to be the first working day of a week. The first preference is more important than the second one.

$\backslash$table$[[$M$,$T$,$W$,$Th$,$F$,$S$,$Su$,$Worker,$\backslash$table$[[$Days assigned$],[($Five days to work$)]]],[6,1,3,3,2,3,3,1,],[,,,,,,,2,],[$A$,$B$,$C$,$D$,$E$,$F$,$G$,3,],[$H$,$I,J$,$K$,$L$,$M$,$N$,4,$V$],[$O$,$P$,$Q$,$R$,$S$,$T$,$U$,5,$W$],[,,,,,,,,]]$