The Dhammasa³ga¼ø gives an enumeration of these dhammas classifying them under the Tika and Duka groups. Vibha³ga analyses them to show what dhammas are contained in the major categories of khandhas, æyatanas, dhætus etc. Dhætukathæ studies the relationship of dhammas listed in the Mætikæ with each component of these major categories of khandhas, æyatanas and dhætus. Yamaka resolves ambiguity in the internal and external relationship of each dhamma. Pa¥¥hæna forming the last book of the Abhidhamma brings together all such relationship in a co-ordinated form to show that the dhammas do not exist as isolated entities but they constitute a well ordered system in which the smallest unit conditions the rest of it and is also being conditioned in return. The arrangement of the system is so very intricate, complex, highly thorough and complete that it earns for this treatise the reputation of being deep, profound and unfathomable.