743.
The construction of the stairs: The stairs _c d_ go down to _f g_,
and in the same way _f g_ goes down to _h k_.
744.
ON MOVING HOUSES.
Let the houses be moved and arranged in order; and this will be done
with facility because such houses are at first made in pieces on the
open places, and can then be fitted together with their timbers in
the site where they are to be permanent.
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