Any child can make a heptagon at once, notwithstanding Mr. Abbott calls it so difficult.
In the power room of the heptagon a hexan officer turned fiercely to another, who was offering advice.
heptagon, hep′ta-gon, n. a plane figure with seven angles and seven sides.
As that dazzling wall sprang into being, the sparkling green protection died from the walls of the heptagon.
There he and his fellows labored day after day learning every secret of every item of armament and equipment aboard the heptagon.