Among $$\text{BF}_3$$, $$\text{NF}_3$$, $$\text{PH}_3$$, $$\text{IF}_3$$, $$\text{IF}_5$$ and $$\text{SF}_4$$ the number of species having the same number of loan pair of electrons on central atom is ____

The lone pairs on the central atom are 0 in $$\text{BF}_3$$, 1 in $$\text{NF}_3$$, 1 in $$\text{PH}_3$$, 2 in $$\text{IF}_3$$, 1 in $$\text{IF}_5$$ and 1 in $$\text{SF}_4$$. The largest group with the same number is the four species with one lone pair, $$\text{NF}_3$$, $$\text{PH}_3$$, $$\text{IF}_5$$ and $$\text{SF}_4$$.