Buffy - 1
Angel - 1-2
Buffy - 2-3
Angel - 3-4
Buffy - 4-7
Angel - 5-7
Buffy - 8
Angel - 8
Buffy - 9
Angel - 9-10
Buffy - 10-12
Angel - 11-13
Buffy - 13-14
Angel - 14-17
Buffy - 15-18
Angel - 18
Buffy - 19
Angel - 19
Buffy - 20
Angel - 20-21
Buffy - 21-22
Angel - 22
Like that for Buffy 4 and Angel 1.
--
IMO.