Counter Example Trace:
Role to check REACHABILITY: target

==> Step 1:
Target User: user108
CAN ASSIGN rule applied to user108: <Provost,Professor&-DeptChair&-President&-Provost,Dean>
Administrative user to invoke the rule: user6
Role configuration of user108 before applying rule: Professor
Role configuration of user108 after applying rule: Professor Dean

==> Step 2:
Target User: user110
CAN ASSIGN rule applied to user110: <Provost,Professor&-DeptChair&-President&-Provost,Dean>
Administrative user to invoke the rule: user6
Role configuration of user110 before applying rule: Professor
Role configuration of user110 after applying rule: Professor Dean

==> Step 3:
Target User: user2
CAN REVOKE rule applied to user2: <Dean,DeptChair>
Administrative user to invoke the rule: user1
Role configuration of user2 before applying rule: DeptChair Professor
Role configuration of user2 after applying rule: Professor

==> Step 4:
Target User: user6
CAN ASSIGN rule applied to user6: <Admin,Provost,target>
Administrative user to invoke the rule: user0
Role configuration of user6 before applying rule: Provost Professor
Role configuration of user6 after applying rule: Provost Professor target

user6 can REACH target
target is REACHABLE