(digits: string[])
| 21 | pickTwoDifferentDigits(): [string, string] |
| 22 | pickThreeDifferentDigits(): [string, string, string] |
| 23 | fromDigits(digits: string[]): string |
| 24 | isTooSimple(code: string): boolean |
| 25 | isAllSame(code: string): boolean |
| 26 | } |
no outgoing calls