A gardener is planting four different types of flowers in a row: Black Petunias, White Daisies, Gray Lilies, and Brown Roses. The Black Petunias must be planted before the White Daisies, and the Gray Lilies must be planted before the Brown Roses. Additionally, the Gray Lilies must be planted immediately next to the Brown Roses. How many distinct orderings of the flower types are possible?
2
3
4
5
6
