I am looking to solve a problem.
I have a pool of 10 volunteers. usually 5 or 6 are required on an assignment.
some of these volunteers work in a group of friends (three or four together) on most of the assignments.
I would like to know if I can find a minimum 3 volunteers from first assignment that worked in assignment 2.
their names could be in different order in each assignment
an example given below
[Blocked Image: https://mail.google.com/mail/u/0/?ui=2&ik=301992c4d9&view=fimg&th=154a3fbf2fea4823&attid=0.1&disp=emb&realattid=ii_154a3fbf2fea4823&attbid=ANGjdJ9xTT4aPHyOvAv2E8IZTN0PTU228dblEjZHKiYqsSukEQQNqRYty8ZbI3QEetH4YT84jK35Y-THHRBEYTUIS603-fNnmBKl1U7Yncbp4edk7rGcGW5YvAm5wCA&sz=s0-l75&ats=1463040079012&rm=154a3fbf2fea4823&zw]