class wr_seq extends uvm_sequence #(wrap_txn);
    `uvm_object_utils(wr_seq)
    wrap_txn txn;
    function new(string name = "wr_seq");
        super.new(name);
    endfunction

    task body();
        txn=wrap_txn::type_id::create("txn");
        start_item(txn);
        assert(txn.randomize() with {wr_rd == 1;});
        finish_item(txn);
    endtask

endclass

class rd_seq extends uvm_sequence #(wrap_txn);
    `uvm_object_utils(rd_seq)
    wrap_txn txn;
    function new(string name = "rd_seq");
        super.new(name);
    endfunction

    task body();
        txn=wrap_txn::type_id::create("txn");
        start_item(txn);
        assert(txn.randomize() with {wr_rd ==0;});
        finish_item(txn);
    endtask
endclass

class seq extends uvm_sequence#(wrap_txn);
    `uvm_object_utils(seq)
    wr_seq w_s;
    rd_seq  r_s;
    function new(string name = "seq");
        super.new(name);
    endfunction
    task body();
     `uvm_do(w_s);
     `uvm_do(r_s);
    endtask
endclass