assemble method #3
Description
var psc = require('parseshortcss');
console.log(psc.assemble([{'border-top-left-radius': '9px'}, {'border-top-right-radius': '9px'}, {'border-bottom-left-radius': '9px'}, {'border-bottom-right-radius': '9px'}]));
// {'border-radius': '9px'}