Using only four colors, you have to color a planar map in such a way that no two adjacent regions have the same color.

b$.$ A $3-$foot$-$tall monkey is in a room where some bananas are suspended from the $8-$foot ceiling. He would like to get the bananas. The room contains two stackable, movable, climbable $3-$foot$-$high crates.

c$.$ You have a program that outputs the message "illegal input record" when fed a certain file of input records. You know that processing of each record is independent of the other records. You want to discover what record is illegal.

d$.$ You have three jugs, measuring $12$ gallons, $8$ gallons, and $3$ gallons, and a water faucet. You can fill the jugs up or empty them out from one to another or onto the ground$\_$ You need to measure out exactly one gallon