Sometimes it is useful to make a chart or table of the possibilities. It make take quite a few days for the students to catch on to ways to find out who the Brights and Braves are. Give them time, and try to assist them in structuring their thinking if they become frustrated. It's not uncommon for students to lose solutions as fast as they find them. Help students to make tables, write down statements or use other tricks to remember how they figured something out.
Logical structures are often intricate and hard to hold in our minds all at once.
Encourage students by assuring them that it gets easier with practice. If you discover an answer and then lose it again, it will be much easier to discover the second time. We often think of people who lie as being bad people. We may expect them to be rude, unfriendly, or disobedient. This is not the case at Unusual School, however.