As usual we may have different sentineling functions.
2.
Actually, proper subsets of \ mathfrak X may host sentineling tasks that prove harder than those emerging with \ mathfrak X itself.
3.
Is called " detail " of \ mathsf C . \ boldsymbol S spans also over sentry functions on subsets of \ mathfrak X sentineling in this case the intersections of the concepts with these subsets.
4.
They avoid inclusion of c _ 0 \ cup \ { x _ 1, x _ 2, x _ 3 \ } in c _ 3, provided that these points are not used by the latter for sentineling itself against other concepts . " Vice versa " we expect that c _ 1 uses x _ 1 and x _ 3 as its own sentinels, c _ 2 uses x _ 2 and x _ 3 and c _ 4 uses x _ 1 and x _ 2 analogously.
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