15. An educational method for teaching phonetic awareness and reading by using a plurality of structural units, whereby each structural unit comprises a three-dimensional body and a plurality of faces, the method comprising the steps of imprinting a 3-letter word on one of the faces of each of the structural units, assigning an associated 3-letter word as a second member of an instructional word-pair to be associated with the 3-letter word of said imprinting step, wherein the associated second member comprises at least two letters in common with the imprinted word, and marking said associated second member on a face of a different structural unit, one word to a face.
15. An educational method for teaching phonetic awareness and reading by using a plurality of structural units, whereby each structural unit comprises a three-dimensional body and a plurality of faces, the method comprising the steps of imprinting a 3-letter word on one of the faces of each of the structural units, assigning an associated 3-letter word as a second member of an instructional word-pair to be associated with the 3-letter word of said imprinting step, wherein the associated second member comprises at least two letters in common with the imprinted word, and marking said associated second member on a face of a different structural unit, one word to a face. 19. The educational method for teaching phonetic awareness and reading by using a plurality of structural units according to claim 15 , further comprising the steps of picking a first structural unit and displaying a first face of the first structural unit, the first face showing a imprinted 3-letter word imprinted thereon, reading aloud the imprinted 3-letter word, displaying alongside the first structural unit a second member of the instructional word-pair corresponding to the imprinted 3-letter word, reading aloud the second member of the instructional word pair, and pointing to the difference in spelling between the words of the word pair.