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Sorry, parts of remarks slipped into the sourcecode messing it up,
so i´ll post it again in its entirity.

CIRCLE variable a variable b variable c variable color variable base color ! dup 2/ - -1 + c ! a ! 0 b ! 1600 * swap 2* + 1e80000 + base !

SOMELOOP a @ b @ symmetricplot b @ a @ symmetricplot 1 b +! b @ c +! c @ 0 less - if 1 a -! a @ c -! then a @ b @ less if someloop ; then ;

SYMMETRICPLOT 1600 * swap 2* over over base @ + swap over over + color @ ! -1 * + color @ ! base @ -1 * + swap over over + color @ ! -1 * + color @ !

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