There are 12 prepositions starting with A, 5 prepositions starting with B, 2 prepositions starting with C, 4 prepositions starting with D. Additionally, 3 prepositions starting with F, 9 prepositions starting with I, 1 preposition starting with L, 5 prepositions starting with O. There are 1 preposition starting with P, 2 prepositions starting with R, 2 prepositions starting with T, 4 prepositions starting with U. Only 1 preposition starting with V, while 3 prepositions starting with W. In total, there are 54 prepositions across all letters.