+ EL_EM_STEEL_EXIT_CLOSED,
+ EL_EM_STEEL_EXIT_OPEN,
+ EL_DC_STEELWALL_1_LEFT,
+ EL_DC_STEELWALL_1_RIGHT,
+ EL_DC_STEELWALL_1_TOP,
+ EL_DC_STEELWALL_1_BOTTOM,
+ EL_DC_STEELWALL_1_HORIZONTAL,
+ EL_DC_STEELWALL_1_VERTICAL,
+ EL_DC_STEELWALL_1_TOPLEFT,
+ EL_DC_STEELWALL_1_TOPRIGHT,
+ EL_DC_STEELWALL_1_BOTTOMLEFT,
+ EL_DC_STEELWALL_1_BOTTOMRIGHT,
+ EL_DC_STEELWALL_1_TOPLEFT_2,
+ EL_DC_STEELWALL_1_TOPRIGHT_2,
+ EL_DC_STEELWALL_1_BOTTOMLEFT_2,
+ EL_DC_STEELWALL_1_BOTTOMRIGHT_2,
+ EL_DC_STEELWALL_2_LEFT,
+ EL_DC_STEELWALL_2_RIGHT,
+ EL_DC_STEELWALL_2_TOP,
+ EL_DC_STEELWALL_2_BOTTOM,
+ EL_DC_STEELWALL_2_HORIZONTAL,
+ EL_DC_STEELWALL_2_VERTICAL,
+ EL_DC_STEELWALL_2_MIDDLE,
+ EL_DC_STEELWALL_2_SINGLE,