.col-xs-4 Since 9 + 4 = 13 > 12,l-xs-6 Subsequent colum this 4-column-wide div gets wrapped onto a new line as one contiguous unit.
.col-xs-6 Subsequent columns continue along the new line.
.col-xs-6 Subsequent columns continue alonl-xs-6 Subsequent columl-xs-6 Subsequent columg the new line.
.col-xs-4 Since 9 + 4 = 13 > 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.
.col-xs-6 Subsequent columnsl-xs-6 Subsequent columl-xs-6 Subsequent columl-xs-6 Subsequent colum continue along the new line.
.col-xs-4 Since 9 + 4 = 13 &gl-xs-6 Subsequent columt; 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.
.col-xs-6 Subsequent columnsl-xs-6 Subsequent columl-xs-6 Subsequent columl-xs-6 Subsequent columl-xs-6 Subsequent colum continue along the new line.