The German military Enigma included a plugboard ("Steckerbrett" in German) which swapped letters (indicated here by ) before and after the main scrambler's change (indicated by ). The plugboard connections were known to the cryptanalysts as Stecker values. If there had been no plugboard, it would have been relatively straightforward to test a rotor setting; a Typex machine modified to replicate Enigma could be set up and the crib letter codice_2 encrypted on it, and compared with the ciphertext, codice_7. If they matched, the next letter would be tried, checking that codice_8 encrypted to codice_9 and so on for the entire length of the crib. If at any point the letters failed to match, the initial rotor setting would be rejected; most incorrect settings would be ruled out after testing just two letters. This test could be readily mechanised and applied to all settings of the rotors.