A dental office has $3$ resources in its generic patient care process flow$($listed in the table$).$ The capacity $($patients per hour per individual resource$)$ is listed in the first column and the number of each resource available for each phase are listed in the second column. The bottleneck is and the capacity per hour is

Reception$/$check out

$81$

Hygienist

$32$

Dentist

$51$

Reception$/$ checkout, $8$

Dentist, $16$

Dentist, $5$

Hygienist, $6$