//$fn=100;

module BlockWithText(txt="a"){
    difference(){
        cube([10,5,5]);
        translate([.5,.5,4.5])
            cube([9,4,1]);
    }
    translate([5,1,4.5])
        linear_extrude(0.5)
            text(txt,size=3,font="Hack",halign="center");
}
rotate([0,-90,0])
translate([0,0,-5])
union(){
    BlockWithText("00");
    translate([10,0,5])
        rotate([0,10,0])
            translate([0,0,-5])
                union(){
                    BlockWithText("10");
                    translate([10,0,5])
                        rotate([0,10,0])
                            translate([0,0,-5])
                                union(){
                                    BlockWithText("20");
                                    translate([10,0,5])
                                        rotate([0,10,0])
                                            translate([0,0,-5])
                                                union(){
                                                    BlockWithText("30");
                                                    translate([10,0,5])
                                                        rotate([0,10,0])
                                                            translate([0,0,-5])
                                                                union(){
                                                                    BlockWithText("40");
                                                                    translate([10,0,5])
                                                                        rotate([0,10,0])
                                                                            translate([0,0,-5])
                                                                                union(){
                                                                                    BlockWithText("50");
                                                                                    translate([10,0,5])
                                                                                        rotate([0,10,0])
                                                                                            translate([0,0,-5])
                                                                                                BlockWithText("60");
                                                                                }
                                                                            }
                                                                        }
                                                                    }
                                                                }
                                                            }