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20 combinations
| #000 | #f00 | #f0f | #0f0 | #0ff | #ff0 | #fff | 
|---|---|---|---|---|---|---|
| #00f | #0f0 | #0ff | #ff0 | #fff | ||
| #f00 | #000 | |||||
| #f0f | #000 | |||||
| #0f0 | #000 | #00f | ||||
| #0ff | #000 | #00f | ||||
| #ff0 | #000 | #00f | ||||
| #fff | #000 | #00f | 
For large scale text.
8 combinations
| #f00 | #0ff | #ff0 | #fff | 
|---|---|---|---|
| #f0f | #fff | ||
| #0ff | #f00 | ||
| #ff0 | #f00 | ||
| #fff | #f00 | #f0f | 
12 combinations
| #000 | #0ff | #ff0 | #fff | 
|---|---|---|---|
| #00f | #ff0 | #fff | |
| #f00 | #fff | ||
| #0ff | #000 | ||
| #ff0 | #000 | #00f | |
| #fff | #000 | #00f | #f00 |