“…with ellipsis '…' means all combinatorial possibilities, P(A), P(B), P(A, C), P(B, D, H) etc. The attributes are separated from each by operators, usually logical [1][2][3][4] and the default, if not shown, is and. As is common, the comma ',' is used for and in theoretical discussion, though in tags it means that the order may be important.…”