The Khagan proclaimed the Great Yassa as an integral body of precedents, confirming the continuing validity of his father's commands and ordinances, while adding his own. Ögedei codified rules of dress and conduct during the kurultais. Throughout the Empire, in 1234, he created postroad stations (Yam) with a permanent staff who would supply post riders' needs. Relay stations were set up every 25 miles and the yam staff supplied remounts to the envoys and served specified rations. The attached households were exempt from other taxes, but they had to pay a qubchuri tax to supply the goods. Ögedei ordered Chagatai and Batu to control their yams separately. The Khagan prohibited the nobility from issuing paizas (tablets that gave the bearer authority to demand goods and services from civilian populations) and jarliqs. Ögedei decreed that within decimal units one out of every 100 sheep of the well-off should be levied for the poor of the unit, and that one sheep and one mare from every herd should be forwarded to form a herd for the imperial table.