The number of species below that have lone pairs of electrons in their central atom is ____________ (Rounded off to the nearest integer)
<img alt="\mathrm{SF}_{4}, \mathrm{BF}_{4}^{-}, \mathrm{CIF}_{3}, \mathrm{AsF}_{3}, \mathrm{PCl}_{5}, \mathrm{BrF}_