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Please give definitions on the phrases 'adjacent surface' and 'immediatley adjacednt surface'?
It is impossible to be fully prescriptive on some matters and the intention is to convey the undersatinding and application.
In this case, the fixed features S2.3 at an 'adjacent surface' is intended to mean the edge of the existing surface that has been broken into. 'Immediately adjacent surfaces' are the surfaces within the reisnstatement in which the fixed feature is laid.