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CHIP Mux4Way16 {
    IN a[16], b[16], c[16], d[16], sel[2];
    OUT out[16];

    PARTS:
    Mux16(a[0..15]=a[0..15], b[0..15]=b[0..15], sel=sel[0], out[0..15]=abMux);
	Mux16(a[0..15]=c[0..15], b[0..15]=d[0..15], sel=sel[0], out[0..15]=cdMux);
	Mux16(a[0..15]=abMux, b[0..15]=cdMux, sel=sel[1], out[0..15]=out);
}