a, b {
	color: blue;

	& c, & d {
		color: blue;
	}
}

a, b {
	color: blue;

	& c, & d {
		color: blue;

		& e, & f {
			color: blue;
		}
	}
}

a, b {
	color: blue;

	& & {
		color: blue;
	}

	c & {
		color: red;
	}

	& c, c & {
		color: red;
	}
}

a {
	color: blue;

	@media {
		color: blue;
	}
}

a {
	color: blue;

	& b {
		color: blue;

		@media {
			color: blue;
		}
	}

	@media {
		color: blue;

		& c {
			color: blue;
		}
	}
}

a {
	color: blue;

	@unknown test {
		color: red;
	}
}

b {
	color: blue;

	@phone {
		color: red;
	}

	@media {
		color: blue;

		& c {
			color: blue;
		}
	}
}