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+% Blackboard bold numerals, Alan Jeffrey, 12--18 Dec 1989.
+
+% -------------------------------------------------------------------
+
+bbnum ("0");
+ "The number 0";
+
+ % The curve.
+ var (path) zeropath;
+
+ zeropath
+ = oabove Top~Middle {left}
+ .. Horizon~Left {down}
+ .. obelow Bottom~Middle {right}
+ .. Horizon~Right {up}
+ .. cycle;
+
+ % The emphasis.
+ draw
+ fatcliptwice
+ (obelow rightof Bottom~Left -- oabove rightof Top~Left)
+ (zeropath);
+
+ % The curve.
+ draw zeropath;
+
+endchar;
+
+% -------------------------------------------------------------------
+
+bbnum ("1");
+
+ fatsymmetric;
+
+ "The number 1";
+
+ % The top serif.
+ draw
+ rightof Top~Middle
+ -- (Top - CCurl)~Left;
+
+ % The vertical, clipped by the top serif.
+ draw
+ fatcliponce
+ (Bottom~Middle -- Top~Middle)
+ (rightof Top~Middle -- (Top - CCurl)~Left);
+
+ % The bottom serif.
+ draw
+ Bottom~Left
+ -- Bottom~Right
+
+endchar;
+
+% -------------------------------------------------------------------
+
+bbnum ("2");
+ "The number 2";
+
+ % The outline.
+ var (path) twopath;
+
+ twopath
+ = (Top-CCurl)~Left
+ .. oabove Top~Middle {right}
+ .. (Top -+- threeBar)~Right {down}
+ .. Bottom~Left {down};
+
+ % The emphasis.
+ draw
+ fatcliptwice
+ (leftof Bottom~Right -- oabove leftof Top~Right)
+ (twopath);
+
+ % The curve.
+ draw twopath;
+
+ % The base line.
+ draw
+ Bottom~Left
+ -- Bottom~Right
+
+endchar;
+
+% -------------------------------------------------------------------
+
+bbnum ("3");
+ "The number 3";
+
+ % The curve.
+ var (path) threepath;
+
+ threepath
+ = (Top - CCurl)~Left
+ .. oabove Top~Middle {right}
+ .. (Top -+- threeBar)~Right {down}
+ .. threeBar~Middle {left}
+ & threeBar~Middle {right}
+ .. (threeBar -+- Bottom)~Right {down}
+ .. obelow Bottom~Middle {left}
+ .. (Bottom + CCurl)~Left;
+
+ % The top emphasis.
+ draw
+ fatcliptwice
+ (leftof threeBar~Right -- oabove leftof Top~Right)
+ (threepath);
+
+ % The bottom emphasis.
+ draw
+ fatcliptwice
+ (obelow leftof Bottom~Right -- leftof threeBar~Right)
+ (threepath);
+
+ % The curve.
+ draw threepath
+
+endchar;
+
+% -------------------------------------------------------------------
+
+bbnum ("4");
+ "The number 4";
+
+ % The right of the vertical is jut away from the right of the character.
+ var (numeric) verticalRight;
+
+ verticalRight + jut = Right;
+
+ % The bar.
+ draw
+ ABar~Left
+ -- ABar~Right;
+
+ % The vertical, fattened and clipped by the diagonal.
+ outline
+ fatcliponce
+ (leftof Bottom~verticalRight -- leftof Top~verticalRight)
+ (Top~verticalRight -- ABar~Left);
+
+ % The diagonal.
+ draw
+ Top~verticalRight
+ -- ABar~Left
+
+endchar;
+
+% -------------------------------------------------------------------
+
+bbnum ("5");
+ "The number 5";
+
+ % The top horizontal.
+ draw
+ Top~Left
+ -- Top~Right;
+
+ % The vertical, fattened.
+ draw
+ fatten
+ rightof (Bottom + sixBowl)~Left
+ -- rightof Top~Left;
+
+ % The curve.
+ draw
+ (Bottom + sixBowl)~Left
+ --- (Bottom + sixBowl)~Middle
+ .. (Bottom + 1/2sixBowl)~Right {down}
+ .. obelow Bottom~Middle {left}
+ .. (Bottom + CCurl)~Left
+
+endchar;
+
+% -------------------------------------------------------------------
+
+bbnum ("6");
+ "The number 6";
+
+ % The bowl.
+ var (path) sixpath;
+
+ sixpath
+ = (Bottom + 1/2sixBowl)~Right {up}
+ .. (Bottom + sixBowl)~Middle {left}
+ .. (Bottom + 1/2sixBowl)~Left {down}
+ .. obelow Bottom~Middle {right}
+ .. cycle;
+
+ % The tail.
+ draw
+ (Bottom + 1/2sixBowl)~Left
+ --- (Bottom + sixBowl)~Left
+ .. oabove Top~Middle {right}
+ .. (Top - CCurl)~Right;
+
+ % The emphasis.
+ draw
+ fatcliptwice
+ (obelow rightof Bottom~Left -- rightof (Bottom + sixBowl)~Left)
+ (sixpath);
+
+ % The bowl.
+ draw sixpath
+
+endchar;
+
+% -------------------------------------------------------------------
+
+bbnum ("7");
+ "The number 7";
+
+ % The vertical.
+ draw
+ Top~Left
+ -- Top~Right;
+
+ % The diagonal.
+ draw
+ fatten
+ rightof Bottom~Left
+ -- leftof Top~Right
+
+endchar;
+
+% -------------------------------------------------------------------
+
+bbnum ("8");
+ "The number 8";
+
+ % The bowls.
+ var (path) eighttop, eightbottom;
+
+ eighttop
+ = oabove Top~Middle {left}
+ .. (Top -+- threeBar)~Left {down}
+ .. threeBar~Middle {right}
+ .. (threeBar -+- Top)~Right {up}
+ .. cycle;
+
+ eightbottom
+ = threeBar~Middle {left}
+ .. (threeBar -+- Bottom)~Left {down}
+ .. obelow Bottom~Middle {right}
+ .. (Bottom -+- threeBar)~Right {up}
+ .. cycle;
+
+ % The top emphasis.
+ draw
+ fatcliptwice
+ (obelow rightof Bottom~Left -- oabove rightof Top~Left)
+ (eighttop);
+
+ % The bottom emphasis.
+ draw
+ fatcliptwice
+ (obelow rightof Bottom~Left -- oabove rightof Top~Left)
+ (eightbottom);
+
+ % The top bowl.
+ draw eighttop;
+
+ % The bottom bowl.
+ draw eightbottom
+
+endchar;
+
+% -------------------------------------------------------------------
+
+bbnum ("9");
+ "The number 9";
+
+ % The bowl.
+ var (path) ninepath;
+
+ ninepath
+ = (Top - sixBowl)~Middle {left}
+ .. (Top - 1/2sixBowl)~Left {up}
+ .. oabove Top~Middle {right}
+ .. (Top - 1/2sixBowl)~Right {down}
+ .. cycle;
+
+ % The tail.
+ draw
+ (Top - 1/2sixBowl)~Right
+ --- (Top - sixBowl)~Right
+ .. obelow Bottom~Middle {left}
+ .. (Bottom + CCurl)~Left;
+
+ % The emphasis.
+ draw
+ fatcliptwice
+ (oabove rightof Top~Left -- rightof (Top - sixBowl)~Left)
+ (ninepath);
+
+ % The bowl.
+ draw ninepath
+
+endchar;
+
+% -------------------------------------------------------------------