d <product> - discontinue the given <product>
f <customer> - find the given <customer>
h - display this help menu
i - display information about this customer database
s <product> - search for the given <product>
q - quit
r <customer> - remove the given <customer>
Enter option ( dfhisqr ): cust1:prod1
Enter option ( dfhisqr ): cust2:prod1,prod2
Enter option ( dfhisqr ): cust3:prod1,prod2,prod3
Enter option ( dfhisqr ): prod1:cust1,cust2,cust3,cust4,cust5
Enter option ( dfhisqr ): prod2:cust2,cust3,cust4,cust5
Enter option ( dfhisqr ): prod3:cust3,cust4,cust5
Enter option ( dfhisqr ): customer removed
Enter option ( dfhisqr ): product discontinued
Enter option ( dfhisqr ): Customers: 4, Products: 4
# of products/customer: most 4, least 1, average 3
# of customers/product: most 4, least 1, average 3
Most popular product: prod1 [4]
Enter option ( dfhisqr ): quit