Given the task definition and input, reply with output. Given a sentence in Igbo language, translate the sentence to English language keeping the meaning of the original sentence intact

Igbo sentence: The ato akwukwo na-aru oru onu iji nyere aka sikwuo isiokwu na-enyere gi aka nna echiche na ukpuru, Otu o di, they can be purchased individually or as a set. Onye o bula akwukwo juputara ese, tebul, chaati di iche iche na ebe nchekwa ngwaoru-enyere gi aka icheta ihe.
The three books work together to help reinforce topics and help you master the concepts and principles, however, they can be purchased individually or as a set.Each book is filled with diagrams, tables, charts and memory devices to help you remember the material.