On the citation of patent subordinate claims

The first case is impossible, because citation 2 can only have feature b, but not feature c, that is, there is no reference basis; The second case is also unacceptable, which is equivalent to quotation 2 or quotation 3. If any one of them is quoted separately, the question of whether there is a reference basis will arise. The weight 1 can directly refer to the weight 4, which is characterized in that feature A has b and c, and b and c have some symmetry. I don't know if I have answered your doubts.