This is the current selection of units as of January 2018. The set of units is always changing a little bit (additions, deletions, merges), but it should be mostly accurate. Hopefully it gives you a bit of an idea of what's out there.
The three-letter codes are version numbers. The first letter codes for difficulty, the second letter codes for olympiad subject, and the third letter represents a version number (different version numbers are disjoint, for students participating for multiple years).
One semester usually consists of 6-7 units.
| 1 | Harmonic | DGW |
|---|---|---|
| 2 | Harmonic | DGX |
| 3 | Harmonic | ZGW |
| 4 | Homography | ZGY |
| 5 | EV Comp | BCW |
| 6 | Global | BCW |
| 7 | Global | DCW |
| 8 | Global | DCX |
| 9 | Local | DCW |
| 10 | Local | DCX |
| 11 | Global and Local | ZCW |
| 12 | Global and Local | ZCX |
| 13 | Func Eqn | BFW |
| 14 | Func Eqn | DFW |
| 15 | Monster FE | DFW |
| 16 | Monster FE | ZFW |
| 17 | Gen Func | BAX |
| 18 | Sums | BAX |
| 19 | Sums | DAX |
| 20 | Ineq Basic | BAW |
| 21 | Ineq Standard | DAX |
| 22 | Equality | DCW |
| 23 | Equality | ZCW |
| 24 | American Geo | DGX |
| 25 | American Geo | ZGX |
| 26 | Complex Nums | BGW |
| 27 | Complex Nums | DGW |
| 28 | Super Complex | ZGX |
| 29 | Bary | BGW |
| 30 | Bary | DGW |
| 31 | Super Bary | ZGX |
| 32 | Irred | DAX |
| 33 | Analysis | DAY |
| 34 | Analysis | ZAY |
| 35 | Lin Alg | DCY |
| 36 | Lin Alg | ZCY |
| 37 | Hyperbola | ZGX |
| 38 | Combo Null | ZCW |
| 39 | AIME Mods | BNW |
| 40 | Euclid Algorithm | BNY |
| 41 | Euclid Algorithm | DNY |
| 42 | Orders | BNW |
| 43 | Diophantine | DNW |
| 44 | Heavy NT | DNW |
| 45 | Super NT | ZNW |
| 46 | Super NT | ZNX |
| 47 | Core NT | DNY |
| 48 | Rigid | DCW |
| 49 | Rigid | DCX |
| 50 | Rigid | ZCW |
| 51 | Rigid | ZCX |
| 52 | Free | DCW |
| 53 | Free | DCX |
| 54 | Free | ZCW |
| 55 | Free | ZCX |
| 56 | Process | DCY |
| 57 | Process | ZCY |
| 58 | Grinding | ZMY |
| 59 | Grinding | DMY |
| 60 | Induct | BCX |
| 61 | Induct | BCY |
| 62 | Induct | DCX |
| 63 | Induct | DCY |
| 64 | Global and Local | ZCY |
| 65 | NT Construct | DNY |
| 66 | NT Construct | ZNY |
| 67 | Int Polynom | DNY |
| 68 | Int Polynom | ZNY |
| 69 | Size in NT | DNW |
| 70 | Anti Problems | DMW |
| 71 | Anti Problems | ZMW |
| 72 | Anti Problems | DMX |
| 73 | Anti Problems | ZMX |
| 74 | Elem Geo | BGY |
| 75 | Elem Geo | DGY |
| 76 | Complex Nums | DGX |
| 77 | Bary | DGX |
| 78 | AIME Geo | BGX |
| 79 | AIME Geo | BGY |
| 80 | Weird Geo | ZGX |
| 81 | Weird Geo | ZGY |
| 82 | Ineq Func | BAW |
| 83 | Tricky Ineq | DAX |
| 84 | Hard Ineq | ZAY |
| 85 | Func Eqn | DFX |
| 86 | Func Eqn | ZFX |
| 87 | Func Eqn | ZFY |
| 88 | Symm Polynom | BAW |
| 89 | Spiral | DGW |
| 90 | Spiral | ZGW |
| 91 | Invert | DGW |
| 92 | Invert | ZGW |
| 93 | Inversion and Spiral | ZGY |
| 94 | American Geo | DGY |
| 95 | American Geo | ZGY |
| 96 | Intro Graph | BCX |
| 97 | Graph Th | DCX |
| 98 | Graph Th | ZCX |
| 99 | Extremal Graph | ZCX |
| 100 | Courage | DMW |
| 101 | Courage | ZMW |
| 102 | Mystery | BCW |
| 103 | Hall | BCW |
| 104 | Hall | DCW |
| 105 | Russ Combo | DCX |
| 106 | Duluth | ZMY |