O to A and the heirs of her body, then to B for life, then to C and her heirs if C survives A. A has no children. Do this for Common Law Only. O, A, B, and C are alive. Therefore, it is destroyed. O to A for life, then to B and his heirs if B has not moved from Tulsa.
B lives in Tulsa.
O to A for life, then to B and his heirs if B ever marries C at any time in his life. O, A, and B alive. O to A for life, then to B and his heirs if B marries C. O, A, and B alive. Reversion in FSA O, A, and B are still alive. O to A for life, then to B for life if B marries C, then to D and his heirs.