 Aiki-jō practice can help uncover errors in the student's empty-handed aikido technique, and provides an opportunity to apply the principles of aikido in different situations.Saito codified three sets of techniques, the first being twenty "suburi" (solo cutting exercises), the second being ten partnered forms, and the third being two "kata" (solo forms).Some dojo also practice "jiyu-waza" armed with "jō" (a freestyle technique without a predetermined form of attack and response).