w:{"/dev/stdout"0:x} /write to stdout
f:{,//$'x} /stringify and flatten
svgwrap:{f"<svg width='",x,"' height='",y,"'>",z,"</svg>"}
svgon:{f "<svg width='",x,"' height='",y,"'>"}
svgoff:"</svg>"
strokec:"black"
strokew:3
fill:"red"
c:{f"<circle cx='",x[0],"' cy='",x[1],"' r='",y,"' stroke='",strokec,"' stroke-width='",strokew,"' fill='",fill,"' />"}
cc:{f"<circle cx='",x[0],"' cy='",x[1],"' r='",y,"' stroke='",strokec,"' stroke-width='",strokew,"' fill='",z,"' />"}
h:{$[x=0;,0;(,//(!10;"abcdef"))[16\x]]}
h2:{f$[(#h[x])=1;"0";""],$'h[x]}
rgb:{,//"#",h2'x}