SF (for Street Fighter) (has an "original era" and a "revival era". The original era was from 1987 to 1997 (or 1999, if you count updates), which spanned the release of SF1 to SF3. The revival era (2008-present) began with the release of SF4. You can choose to acknowledge or ignore the "revival era" SF games.
Think of SF like Looney Tunes. For Looney Tunes, the original era (1930-1969) was when LT (for Looney Tunes) cartoons were originally made. The revival era (1987-present) is when LT cartoons started being made again.
So anyway,
"Original Era" SF:
1. SF1
2. SF2 series
3. SFA series
4. SF3 series
"Revival Era" SF (as of 8/5/2016):
1. SF4 series
2. SF5
So, I'm curious: Do you acknowledge or ignore the "revival era" SF games, SF4 and SF5?