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mod microcad {
    use std::geo2d::*;
    use std::ops::*;

    sketch IconElement( radius: Length ) {
        c = Sector(radius, start = 180°, end = 270°).translate(y = radius);
        r = Rect(width = radius, height = radius * 2, x = -radius, y = -radius);
        c | r
    }

    sketch Arc(radius: Length, thickness: Length, angle = 300°) {
        Sector(radius, start = -angle / 2, end = angle / 2)
            .rotate(180° - angle) - Circle(radius - thickness)
    }

    pub sketch Icon(radius: Length) {
        prop gap = radius / 5;
        IconElement(radius)
            .translate(x = -radius-gap)
            .rotate([0..3] * 90°); 
    }

    pub sketch Micro( radius: Length, thickness: Length ) {
        u = Sector(radius, 180°).rotate(90°) - Circle(radius-thickness);
        r_l = Rect(width = thickness, height = radius * 3, x = -radius, y = -2*radius);
        r_r = Rect(width = thickness, height = radius * 2, x = radius - thickness, y = -radius);
        u | r_l | r_r
    }

    pub sketch C(radius: Length, thickness: Length) {
        Arc(radius, thickness, 260°)
    }

    pub sketch A(radius: Length, thickness: Length) {
        Arc(radius, thickness)
         | Rect(width = thickness, height = radius * 2, x = radius * 0.5, y = -radius);
    }

    pub sketch D(radius: Length, thickness: Length) {
        Arc(radius, thickness)
         | Rect(width = thickness, height = radius * 3, x = radius * 0.5, y = -radius);
    }
}

use std::ops::*;
use std::math::*;

radius = 1cm;
thickness = radius * 40%;

{
    microcad::Icon(radius);
    {
        microcad::Micro(radius, thickness);
        microcad::C(radius, thickness);
        microcad::A(radius, thickness);
        microcad::D(radius, thickness);
    }.align(X);
}.align(X, 4mm).center().extrude(4mm);