/// Block Element
/// @access public
/// @param {String} $element - Element's name
element($element)
  &__{$element}
    {block}

/// Block Modifier
/// @access public
/// @param {String} $modifier - Modifier's name
modifier($modifier)
  &--{$modifier}
    {block}


/// @alias element
e($element)
  +element($element)
    {block}

/// @alias modifier
m($modifier)
  +modifier($modifier)
    {block}