There are ______ reference lines in a nomogram.

The effective height of a wall of actual height H, partially restrained at the bottom and having no lateral support at t…

A in the figure below represents ______

A panel wall is an ______

Effective length of a wall when it is supported by a buttress only at one end is ______

Effective length of a wall supported by a buttress at each end is ____

A wall cannot be laterally supported at a horizontal level by ______

The actual height of the wall represented by H is the height of the wall between the ______ of support.