1. In the solution are all 9 different letters of EINS, ZWEI, DREI and VIER (German for "one, two, three, four")
2. No letter touches an adjacent letter of the complete alphabet on an edge or corner
3. The field index numbers of EINS and of ZWEI are rising within each word (but not necessarily directly following each other)
4. In field 3 is no letter of DREI
5. Only one of the two following statements is true: In field 3 is a letter of VIER. In field 7 is a letter of DREI
Solution code: row after row from left to right
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