@mixin define-backspace($side, $amount)
{
	#{ select-class(backspace $side $amount) }
	{
		@include set-backspace($side, $amount);
	}
}

@mixin define-backspaces($sides, $amounts)
{
	@each $side in $sides { @each $amount in list-series($amounts)
	{
		@include define-backspace($side, $amount);
	}}
}