<p>"Borromean chain-mail" -- an indefinitely extended pattern in which each small circle is part of four <a href="//commons.wikimedia.org/wiki/File:Borromeanrings.png" title="File:Borromeanrings.png">Borromean rings</a> configurations, and each large circle is part of eight Borromean rings configurations (so that every area contained within circles of three different colors is at the center of a Borromean rings configuration, and no two circles are directly linked).
</p><p>To free a yellow or blue loop, two red loops or two green loops must be cut.  To free a red or green loop, four other loops must be cut.
</p>
For a five-circle configuration which is a subpart of this pattern, see <a href="//commons.wikimedia.org/wiki/File:Borromean-cross.png" title="File:Borromean-cross.png">Image:Borromean-cross.png</a> / <a href="//commons.wikimedia.org/wiki/File:Borromean-cross.svg" title="File:Borromean-cross.svg">Image:Borromean-cross.svg</a> .
AnonMoos
<p><span class="int-own-work" lang="en">Own work</span> -- Generated by means of the following PostScript code:
</p>
<pre>%!
.6 dup scale 306 396 translate/A{87.5 C}def/B{60 C}def 8 setlinewidth
600 400 moveto -800 0 rlineto 0 -600 rlineto 800 0 rlineto closepath clip newpath
/C{0 360 arc closepath gsave 0 setgray 11 setlinewidth stroke grestore stroke}def
0 0 1 setrgbcolor 0 0 B 0 -200 B 0 200 B 0 400 B -200 0 B -200 -200 B -200 200 B
-200 400 B 200 0 B 200 200 B 200 400 B 200 -200 B 400 0 B 400 200 B 400 400 B 400
-200 B 600 0 B 600 200 B 600 400 B 600 -200 B
1 1 0 setrgbcolor -100 -100 B -100 100 B -100 300 B 100 -100 B 100 100 B 100 300
B 300 -100 B 300 100 B 300 300 B 500 -100 B 500 100 B 500 300 B
1 0 0 setrgbcolor -100 0 A -100 200 A -100 -200 A -100 400 A 100 400 A 100 200 A
100 -200 A 100 0 A 300 400 A 300 200 A 300 0 A 300 -200 A 500 200 A 500 0 A 500
400 A 500 -200 A
0 .6 0 setrgbcolor -200 100 A -200 -100 A -200 300 A 0 -100 A 0 100 A 0 300 A 200
-100 A 200 100 A 200 300 A 400 -100 A 400 100 A 400 300 A 600 -100 A 600 100 A
600 300 A
0 setgray 10.5 setlinewidth 0 0 1 setrgbcolor/bluecirc{/y exch def/x exch def
x y 60 23.5 44 arc 0 setgray 11 setlinewidth stroke
x y 60 22.5 45 arc 0 0 1 setrgbcolor 8 setlinewidth stroke
x y 60 -44 -23.5 arc 0 setgray 11 setlinewidth stroke
x y 60 -45 -22.5 arc 0 0 1 setrgbcolor 8 setlinewidth stroke
x y 60 136 156.5 arc 0 setgray 11 setlinewidth stroke
x y 60 135 157.5 arc 0 0 1 setrgbcolor 8 setlinewidth stroke
x y 60 -156.5 -136 arc 0 setgray 11 setlinewidth stroke
x y 60 -157.5 -135 arc 0 0 1 setrgbcolor 8 setlinewidth stroke}def
0 0 bluecirc 0 -200 bluecirc 0 200 bluecirc 0 400 bluecirc -200 0 bluecirc -200
-200 bluecirc -200 200 bluecirc -200 400 bluecirc 200 0 bluecirc 200 200 bluecirc
200 400 bluecirc 200 -200 bluecirc 400 0 bluecirc 400 200 bluecirc 400 400
bluecirc 400 -200 bluecirc 600 0 bluecirc 600 200 bluecirc 600 400 bluecirc 600
-200 bluecirc
1 1 0 setrgbcolor/ylocirc{/y exch def/x exch def
x y 60 46 66.5 arc 0 setgray 11 setlinewidth stroke
x y 60 45 67.5 arc 1 1 0 setrgbcolor 8 setlinewidth stroke
x y 60 -66.5 -46 arc 0 setgray 11 setlinewidth stroke
x y 60 -67.5 -45 arc 1 1 0 setrgbcolor 8 setlinewidth stroke
x y 60 113.5 134 arc 0 setgray 11 setlinewidth stroke
x y 60 112.5 135 arc 1 1 0 setrgbcolor 8 setlinewidth stroke
x y 60 -134 -113.5 arc 0 setgray 11 setlinewidth stroke
x y 60 -135 -112.5 arc 1 1 0 setrgbcolor 8 setlinewidth stroke}def
-100 -100 ylocirc -100 100 ylocirc -100 300 ylocirc 100 -100 ylocirc 100 100
ylocirc 100 300 ylocirc 300 -100 ylocirc 300 100 ylocirc 300 300 ylocirc 500 -100
ylocirc 500 100 ylocirc 500 300 ylocirc
showpage
%EOF</pre>