@each $prop, $abbrev in (margin: m, padding: p) {\n      @each $size, $length in $spacers {\n        .#{$abbrev}#{$infix}-#{$size} { #{$prop}: $length !important; }\n        .#{$abbrev}t#{$infix}-#{$size},\n        .#{$abbrev}y#{$infix}-#{$size} {\n          #{$prop}-top: $length !important;\n        }\n        .#{$abbrev}r#{$infix}-#{$size},\n        .#{$abbrev}x#{$infix}-#{$size} {\n          #{$prop}-right: $length !important;\n        }\n        .#{$abbrev}b#{$infix}-#{$size},\n        ....

code under terms of your choice, provided that, if the incorporated
material is not limited to numerical parameters, data structure
layouts and accessors, or small macros, inline functions and templates
(ten or fewer lines in length), you do both of the following:

   a) Give prominent notice with each copy of the object code that the
   Library is used in it and that the Library and its use are
   covered by this License.