.           $\widetilde{s}$                $\widetilde{t}$          $\widetilde{\sigma}$   $x_{0}$   $x_{0}$   $x_{0}$   $y$   $V$   $ W $   $V\leq W $   ------------------------------ ------------------------------ ---------------------- --------- --------- --------- ----- ----- ------- ------------                                            $\epsilon$              $\widetilde{u}$         0         0         0       0     0      0         T             $\epsilon$                                             $\widetilde{b}$         0         0         0       0     0      0         T                                         $\widetilde{u}$            $\widetilde{u}$         0         0         0       0     0      0         T                                                                    $\widetilde{b}$         0         0         0       0     0      0         F                                            $\epsilon$              $\widetilde{u}$         0         0         0       0     0      0         T          