active zeros mark cons 0 zeros active tail cons X XS mark XS mark zeros active zeros mark cons X1 X2 active cons mark X1 X2 mark 0 active 0 mark tail X active tail mark X cons mark X1 X2 cons X1 X2 cons X1 mark X2 cons X1 X2 cons active X1 X2 cons X1 X2 cons X1 active X2 cons X1 X2 tail mark X tail X tail active X tail X active 1 zeros 0 mark 1 cons 2 0 0 tail 1 INNERMOST ./TRS/TRCSR/inn/Ex4_7_77_Bor03_iGM.trs