For each of the problem types that can easily be solved by direct modeling or counting strategies, describe the direct modeling or counting strategy (or both) that fits the problem type.

JRU
Direct Modeling and
Counting
 JCU
Direct Modeling and
counting
JSU
SRU
Direct Modeling and
Counting
 SCU

Counting
 SSU
PPW-WU
Direct Modeling
 PPW-PU
Direct modeling
CDU
Direct Modeling
 CQU
 CRU