Lone Pairs in this Compound

[salvadorramos3k]

In the compound HN(CH2CH2NH2)2, I know that there are two lone pairs since there are two NH2s, but where is the third lone pair found? In the textbook it says that this is a tridentate ligand.

[Dakota Walker 1L]

I think the third lone pair can be found on the third nitrogen (the NH).

[ValerieChavarin 4F]

The subscript of two shows that there is double of what is inside the parentheses, therefore 2 N. The third one is the N that is on the outside in the HN.