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- var f = .7, ay = f*ax;
- d *= f , fs *= f, ad *=f, sw *=f, pr *= f, pr1 *= f, pr2 *= f;
- ram = +(f*ram).toFixed(e);

svg(viewBox=[-d, -.5*d, 2*d, d].join(' ') 
		| svg { fill: #{darken}; font: #{fs}px consolas, monaco, monospace }
		| svg > [d], [r] { fill: none; stroke: #{llight}; stroke-linecap: round; stroke-width: #{2*sw} }
		| [y] + [d], [d] + [d] ~ [r] { fill: #{orange}; stroke: #{darken}; marker-end: url(#e) }
		| [d] + [y] {  font: #{fs}px times new roman, serif }
		| [r] + [d] { stroke: #{orange}; stroke-width: #{~~(3*sw)} }
		| [d] + [d] { stroke: #{purple}; stroke-width: #{4*sw} }
		| [d] ~ [y] { font-style: italic }
		| tspan { font-size: .5em }
	marker#e(markerWidth=ad markerHeight=ad 
						viewBox='0 -4 8 8' 
						orient='auto' refX='7')
		path(d='M8 0 0-4V4')
	//-radius text
	text(x=(-.5*(hrd + fs)).toFixed(e) y=(-(.5*hrd + .2*fs)).toFixed(e)) R
	text(x=(.5*(hrd - .2*fs)).toFixed(e) y=(-(.5*hrd + .2*fs)).toFixed(e)) R
	text(x=(.5*(-3*hrd - fs)).toFixed(e) y=((.5*hrd - .2*fs)).toFixed(e)) R
	text(x=(.5*(3*hrd - .2*fs)).toFixed(e) y=((.5*hrd - .2*fs)).toFixed(e)) R
	text(x=(-.5*(hrd + fs)).toFixed(e) y=((.5*hrd + .8*fs)).toFixed(e)) R
	text(x=(.5*(hrd - .2*fs)).toFixed(e) y=((.5*hrd + .8*fs)).toFixed(e)) R
	text(x=(.5*(-3*hrd - .2*fs)).toFixed(e) y=(-(.5*hrd + .2*fs)).toFixed(e)) R
	text(x=(.5*(3*hrd - fs)).toFixed(e) y=(-(.5*hrd + .2*fs)).toFixed(e)) R
	path(d=`M${-ax} 0H${ax}`)
	text(x=(ax - .5*fs).toFixed(e) y=(-.5*fs).toFixed(e)) x
	text(x=.4*fs y=(ay - .2*fs)) y
	//-helper circles
	circle(cx=-hrd r=hr)
	circle(cx=hrd r=hr)
	path(d=`M${-2*hrd} ${hrd} 0 ${-hrd} ${2*hrd} ${hrd}
					M${-2*hrd} ${-hrd} 0 ${hrd} ${2*hrd} ${-hrd}
					M${hrd - ram} ${ram}l${-ram}${-ram} ${2*ram}${-2*ram} ${ram} ${ram}
					M${ram - hrd} ${ram}l${ram}${-ram} ${-2*ram}${-2*ram}${-ram} ${ram}
					M${hrd}${-ram}h1M${-hrd}${-ram}h1M${hrd - ram} 0h1M${ram - hrd} 0h1`)
	circle(cx=-hrd r=+pr2.toFixed(e))
	circle(cx=hrd r=+pr2.toFixed(e))
	circle(cy=-hrd r=+pr.toFixed(e))
	circle(cy=hrd r=+pr2.toFixed(e))
	circle(cx=-2*hrd cy=-hrd r=+pr.toFixed(e))
	circle(cx=2*hrd cy=-hrd r=+pr.toFixed(e))
	circle(cx=-2*hrd cy=hrd r=+pr.toFixed(e))
	circle(cx=2*hrd cy=hrd r=+pr.toFixed(e))
	//-point names
	text(y=-(hrd + .2*fs)) T
	text(x=hrd - .4*fs y=fs) O<tspan>0</tspan>
	text(x=-(hrd + .4*fs) y=fs) O<tspan>1</tspan>
	text(x=(.1*fs).toFixed(e) y=(hrd + .8*fs)) S
	text(x=2*hrd - .2*fs y=-(hrd + .4*fs)) A<tspan>0</tspan>
	text(x=-(2*hrd + .6*fs) y=-(hrd + .4*fs)) A<tspan>1</tspan>
	text(x=2*hrd - .2*fs y=(hrd + fs)) B<tspan>0</tspan>
	text(x=-(2*hrd + .6*fs) y=(hrd + fs)) B<tspan>1</tspan>

// minimal SVG
<svg viewBox='-1750 -875 3500 1750' xmlns='http://www.w3.org/2000/svg'><style>svg{fill:#333;font:105px consolas,monaco,monospace}svg>[d],[r]{fill:none;stroke:#ccc;stroke-linecap:round;stroke-width:7}[y]+[d],[d]+[d]~[r]{fill:#f90;stroke:#333;marker-end:url(#e)}[d]+[y]{font:105px times new roman,serif}[r]+[d]{stroke:#f90;stroke-width:10}[d]+[d]{stroke:#95a;stroke-width:14}[d]~[y]{font-style:italic}tspan{font-size:.5em}</style><marker id='e' markerWidth='7' markerHeight='7' viewBox='0 -4 8 8' orient='auto' refX='7'><path d='M8 0 0-4V4'/></marker><text x='-274' y='-242'>R</text><text x='211' y='-242'>R</text><text x='-716' y='200'>R</text><text x='653' y='200'>R</text><text x='-274' y='305'>R</text><text x='211' y='305'>R</text><text x='-674' y='-242'>R</text><text x='611' y='-242'>R</text><path d='M-1230 0H1230'/><text x='1178' y='-53'>x</text><path d='M0-861V861'/><text x='42' y='840'>y</text><circle cx='-442' r='625'/><circle cx='442' r='625'/><path d='M-884 442 0-442 884 442M-884-442 0 442 884-442M386 56l-56-56 112-112 56 56M-386 56l56-56-112-112-56 56M442-56h1M-442-56h1M386 0h1M-386 0h1'/><path d='M0-442H884V442H-884V-442H0V442'/><circle cx='-442' r='9'/><circle cx='442' r='9'/><circle cy='-442' r='18'/><circle cy='442' r='9'/><circle cx='-884' cy='-442' r='18'/><circle cx='884' cy='-442' r='18'/><circle cx='-884' cy='442' r='18'/><circle cx='884' cy='442' r='18'/><text y='-463'>T</text><text x='400' y='105'>O<tspan>0</tspan></text><text x='-484' y='105'>O<tspan>1</tspan></text><text x='11' y='526'>S</text><text x='863' y='-484'>A<tspan>0</tspan></text><text x='-947' y='-484'>A<tspan>1</tspan></text><text x='863' y='547'>B<tspan>0</tspan></text><text x='-947' y='547'>B<tspan>1</tspan></text></svg>
              body {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	margin: 0;
	height: 100vh;

svg { display: block }
              // minimal SVG: https://codepen.io/thebabydino/pen/aLXgGZ?editors=1000
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