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site, with an artificially raising interior
*Bb – a bank and ditch encircling the site on a natural hillock, where the ground surface slopes so that the interior is higher than the exterior
*C – a bank on one side with sloping ground on the other
*D – a bank on one side with sloping ground on the other combined with a ditch and an artificially raised interior
*Dd – a bank on one side with sloping ground on the other combined with a ditch and the interior raised by a natural hillock

See also

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