/* side-side-offset */
.first{
	background-position:  top left 50pt;
}
.second{
	background-position:   left top  50pt;
}
.third{
	background-position:bottom left 50pt;
}
.fourth{
	background-position:left bottom 50pt, 
}
.fifth{
	background-position:top right 50pt
}
.sixth{
	background-position: right top 50pt;
}
.seventh{
	background-position: bottom right 50pt;
}
.eighth{
	background-position: right bottom 50pt;
}
.ninth{
	background-position: center bottom 0;
}
.tenth{
	background-position: bottom center 50pt; /* invalid - "center" is not a side */
}
.eleventh{
	background-position: center center 50pt; /* invalid - "center" is not a side */
}
.twelveth{
	background-position: top top 50pt; /* invalid - 2 equal sides */
}
.thirteenth{
	background-position: top bottom 50pt; /* invalid - one axis (top-bottom/left-right) */
}
.fourteenth{
	background-position: center bottom 50; /* invalid - non-zero unitless offset */ 
}
/* side-offset-side */
.fifteenth{
	background-position: top 50pt left;
}
.sixteenth{
	background-position: left 50pt top
}
.seventeenth{
	background-position: right 0 bottom
}
.eighteenth{
	background-position: bottom 0 right
}
.nineteenth{
	background-position: right 20pt top
}
.twentieth{
	background-position: top 20pt right
}
.twenty-first{
	background-position: top 20pt center;
}
.twenty-second{
	background-position: right 30pt center;
}
.twenty-third{
	background-position: center 20pt top; /* invalid - "center" is not a side */
}
.twenty-fourth{
	background-position: top 20 center ; /* invalid - non-zero unitless offset */ 
}
.twenty-fifth{
	background-position: right 20pt left; /* invalid - one axis (top-bottom/left-right) */
}
/* completely invalid */
.twenty-sixth{
	background-position: right center top;
}
.twenty-seventh{
	background-position: 20pt 30px 40em;
}
.twenty-eighth{
	background-position: 20pt top left;
}
.twenty-nineth{
	background-position: 20pt 30px right;
}
.thirtieth{
	background-position: 20pt top 30px;
}
.thirty-first{
	background-position: left 20% 20px;
}






