$space-scales: 0, 0.25, 0.5, 1, 1.5, 2, 3, 4, 5 !default;
$padding-properties: (
    '': 'padding',
    't': 'padding-top',
    'r': 'padding-right',
    'l': 'padding-left',
    'b': 'padding-bottom',
    'x': ('padding-left','padding-right'),
    'y': ('padding-top','padding-bottom')
) !default;

$margin-properties: (
    '': 'margin',
    't': 'margin-top',
    'r': 'margin-right',
    'l': 'margin-left',
    'b': 'margin-bottom',
    'x': ('margin-left','margin-right'),
    'y': ('margin-top','margin-bottom')
) !default;

@include spacing-class('p', $padding-properties, $space-scales);
@include spacing-class('m', $margin-properties, $space-scales, true, true, true);