The following is the POV-Ray code used to produce this output.

#include "colors.inc"
#include "shapes.inc"   

camera
{
        location <0, 2, -3>
        look_at <0, 0, 0>
}                                 

object
{
        sphere
        {
                <0, 0, 0>, 1
                texture
                {
                        pigment { color Blue}
                        finish { ambient 0.3 }
                }
        }
        clipped_by{plane{-y,0.1}}

        rotate <23,0,23>         
        translate <-0.2, 0.4, 0.2>
}

object
{
        sphere
        {
                <0, 0, 0>, 1
                texture
                {
                        pigment { color Red }
                        finish { ambient 0.3 }
                }
        }
        clipped_by{plane{y,0.1}}

        rotate <23,0,23>
        translate <0.2, -0.4, -0.1> 
}

object
{
        sphere
        {
                <0, 0, 0>, 1
                texture
                {
                        pigment { color Green }
                        finish { ambient 0.3 }
                }
        }
        clipped_by{plane{y, 0.1}}
        clipped_by{plane{-y, 0.1}} 
        
        rotate <23,0,23> 
}

plane
{
        <0, 1, 0>, -1.2
        no_image
}

text {
        ttf "cyrvetic.ttf" "A" 0.05, 0
        pigment { Blue }
        finish { ambient 0.3 }
        scale 0.3             
        translate -1.53*x +0*y -0.5*z
        rotate <33.7,0,0>
}

text {
        ttf "cyrvetic.ttf" "B" 0.05, 0
        pigment { Red }
        finish { ambient 0.3 }
        scale 0.3             
        translate -1.06*x -0.84*y -0.5*z
        rotate <33.7,0,0>
}

text {
        ttf "cyrvetic.ttf" "A   B" 0.05, 0
        pigment { Green }
        finish { ambient 0.3 }
        scale 0.3             
        translate -1.53*x -0.42*y -0.5*z
        rotate <33.7,0,0>
}

text {
        ttf "cyrvetic.ttf" " U " 0.05, 0
        pigment { Green }
        finish { ambient 0.3 }
        rotate <180,0,0>
        scale 0.3             
        translate -1.39*x -0.2*y -0.5*z
        rotate <33.7,0,0>
}                               

light_source { <0, 3, -2> color White}

I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.