Word Search :

1.
S₁: The houses in the Indus Valley were built of baked bricks.
S₆: They led outside into covered sewers which ran down the side of the streets.

P: This staircase sometimes continued upwards on to the roof.
Q: Access to the upstairs rooms was by a narrow stone staircase at the back of the house.
R: The drains were incorporated in the walls.
S: The houses had bathrooms and water closets, rubbish chutes and excellent drainage systems.