The letter B is based on a vertical straight line joined with parts of two circles one upon the other.
The upper circle is smaller than the lower and to the left of it, touching the upright as shown..
Combining the two and removing the overlaps gives the basic B shape
Look at the make-up of the letter in the animation below.
The Letter D is based on a vertical straight line and part of a circle
Combining and removing the overlaps gives the following
The Letter P consists of a straight vertical line and part of a slightly flattened circle (ellipse)
Combining and remove overlap produces the basic shape.
The letter R is similar, the ellipse is slightly smaller and the letter has a diagonal.
The Letter U consists of two upright straight lines and part of an ellipse
The Letter J consists of one upright straight line and part of a circle
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