Example of .less with concatenated rule

concat_rule_failure

body
{
	background: url("../images/bg-page.jpg") no-repeat scroll 50% 0 #050404;
}

img
{
	display: block;
}

footer
{
	border-top: none;
	margin-top: 0;
	padding-top: 0;
	
	p
	{
		font-size: 10px;
		color: white;
	}
}

#cchs-logo
{
	display: block;
	margin: 10px 0 0 0;
}

header
{
	.search
	{
		background: url("../images/bg-page-top.gif") scroll left top repeat;
		overflow: auto;

		/* Override Bootstrap to float form right */
		.row > form[class*="span"]
		{
			display: block;
			float: right;
			margin: 0 5px 0 0;
		}

		.row
		{
			margin-bottom: 0;
		}

		form
		{
			background-color: #000;

			fieldset
			{
				padding-top: 4px;
				margin-bottom: 6px;
			}

			legend
			{
				color: #fff;
				font-size: 10px;
				margin: 0;
				padding: 5px 0 0 5px;
				text-transform: uppercase;
			}

			input[type="text"]
			{
				width: 140px;
				margin: 0 0 0 5px;
				color: #333;
				font-size: 11px;
				height: 9px;
			}
		}

		nav ul
		{
			margin-bottom: 0;

			li
			{
				display: block;
				float: left;

				a
				{
					color: #fff;
					text-transform: uppercase;
					display: inherit;
					padding: 3px 9px;
					font-size: 11px;
					letter-spacing: 1px;
				}

				a:hover
				{
					background-color: black;
					text-decoration: none;
				}

                                &.active
			        {
				    background-color: black;
			        }
			}
		}
	}
}