A Small Monster collector is visiting the Knightrola region, bringing 30 Small Monster Containment Devices with them. The devices are highly reliable and can effectively be assumed to always work. How many different types of Small Monsters can the collector capture under the following conditions?

a. The collector has access to Grass, Space, Electric Scooter, Mask, Citrus, and Rubber Duck type Small Monsters

b. The above, and intends to capture at least one of each of those types

c. Both of the above, and intends to capture at least five Space types

d. All of the above, and intends to capture at most four Electric Scooter types

e. All of the above, and intends to capture at most three Rubber Duck types