$line_height: (
		"small": 1em,
		"normal": 1.5em,
		"medium": 1.6em,
		"large": 1.8em,
		"2x": 2em,
		"3x": 3em,
		"21": 21px,
		"24": 24px,
		"34": 34px,
		"42": 42px,
);
@each $k, $v in $line_height {
	.line-#{$k} {
		line-height: $v !important;
	}
}