H3K4me1 - Poised and active enhancers

H3K27Ac - Active promoters and enhancers

H3K27me3 - inactive promoters

H3K4me3 - Active and poised transcription start sites

H3K9me3 - Inactive chromatin, ( also heterochromatin )

Some simple math to know overlapping combinations. Here is a nice blog about histone modifications. "Histone Proteins and Modifications" This blog will be offline sometime, do check later.