Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.6)
// Compass (v1.0.0.alpha.18)
// ----

$bgEven: #FED;
$bgOdd: #DAD;
    .odd{ backgeound-color:$bgOdd;}
.even{ backgeound-color:$bgEven;}
.oddEven .gridItem:nth-child(even){background-color:$bgEven;}
.oddEven .gridItem:nth-child(odd){background-color:$bgOdd;}

//now lets kill IE8
.oddEven .gridItem:nth-child(odd){@extend .even;}

SassMeister-output.css

.odd {
  backgeound-color: #ddaadd;
}

.even, .oddEven .gridItem:nth-child(odd) {
  backgeound-color: #ffeedd;
}

.oddEven .gridItem:nth-child(even) {
  background-color: #ffeedd;
}

.oddEven .gridItem:nth-child(odd) {
  background-color: #ddaadd;
}