four-colour
| problem
| four-colour abbr. | |
| brit. | Vierfarb... |
| problem abbr. | |
| gen. | Aufgabe; Fragestellung; Problem; Problemstellung; Schwierigkeit; Sorge |
| comp., MS | Problem |
| tech. | Unklarheit |
| |||
| Vierfarb... m | |||
|
four-colour : 11 phrases in 6 subjects |
| Artificial intelligence | 1 |
| British usage, not spelling | 2 |
| Communications | 1 |
| Optics branch of physics | 1 |
| Polygraphy | 4 |
| Technology | 2 |