The community of gnomes in the Magic Forest is upset because their forest is being bulldozed for a shopping mall. The little people are moving far away, too far to walk. They are going in the boats they made from the bark of the trees. Each boat can hold up to and including 100 grams, and still stay afloat. The gnomes, as it happens, come in five different weights: 60 grams (senior citizens), 40 grams (adults), 20 grams (teenagers), 10 grams (children), and 5 grams (infants). What are the possible combinations of gnomes that can safely be put into a boat?