Inaya constitutions & services construction of public works based on general planning, instruction, and control (incl. Repair, improvement, or demolition work) interior finishing using wood, plaster board, sound absorbing board, wallpaper, tatami mat, vinyl floor tiles, carpeting, or fusuma sliding doors. construction of facilities for water intake, water purification, or water distribution for public water supplies or factories or installation of public sewage or basin sewage handling facilities.