Masonry unit can be used either as structural or non-structural application in construction. You are asked to provide information related to clay brick and interlocking concrete block to be used in a construction project. Based on your understanding and knowledge: (a) Propose and sketch one unit of the brick and interlocking block Compare and contrast with justification between clay brick and interlocking concrete block on the basis of: (b) physical properties and testing (including symptom of efflorescence, soundness, hardness etc.) (c) material properties (strength & durability) (d) efficiency and economy aspects