Identify pairs of corresponding, alternate, and interior angles given that AB // CD.

Here are the solutions to the problems based on the figure where AB // CD:

a) 2 pairs of equal corresponding angles.
Corresponding angles are in the same relative position at each intersection.

i) $\angle f = \angle j$

ii) $\angle e = \angle i$
(Other valid pairs include: $\angle g = \angle k$, $\angle h = \angle l$, $\angle b = \angle n$, $\angle a = \angle m$, $\angle c = \angle o$, $\angle d = \angle p$)

b) 2 pairs of equal alternate angles.
Alternate angles are on opposite sides of the transversal.

i) $\angle h = \angle i$ (Alternate interior angles)

ii) $\angle c = \angle n$ (Alternate interior angles)
(Other valid pairs include: $\angle g = \angle j$, $\angle b = \angle o$ for interior; $\angle f = \angle l$, $\angle e = \angle k$, $\angle a = \angle p$, $\angle d = \angle m$ for exterior)

c) 2 pairs of interior angles which are supplementary.
Interior angles on the same side of the transversal are supplementary (add up to $180^\circ$).

i) $\angle h + \angle j = 180^\circ$

ii) $\angle c + \angle m = 180^\circ$
(Other valid pairs include: $\angle g + \angle i = 180^\circ$, $\angle b + \angle p = 180^\circ$)