.parens{border:2px solid black;margin:1px 3px 16 3;width:36;padding:2px 36px;}
.more-parens{padding:8 4 4 4px;width:96;height:113;margin:12;}
.nested-parens{width:71;height:6;}
.mixed-units{margin:2px 4em 1 5pc;padding:6px 1em 2px 2;}