Bootstrap

Window size: XS. (<768px)

Window size: SM. (≥768px, <992px).

Window size: MD. (≥992px, <1200px).

Window size: LG. (≥1200px)

col-sm-6
col-sm-6
col-sm-4
col-sm-8
col-sm-3
col-sm-9
col-sm-4
col-sm-4
col-sm-4
col-sm-3 col-md-2
col-sm-9 col-md-8
col-sm-12 col-md-2

With 'clearfix' for md and sm:
col-sm-6
col-md-4
col-lg-3
col-sm-6 col-md-4 col-lg-3
col-sm-6
col-md-4 col-lg-3
col-sm-6 col-md-4 col-lg-3
col-sm-6
col-md-4 col-lg-3
col-sm-6 col-md-4 col-lg-3
col-sm-6
col-md-4 col-lg-3
col-sm-6 col-md-4 col-lg-3
col-sm-6
col-md-4 col-lg-3
col-sm-6 col-md-4 col-lg-3
col-sm-6
col-md-4 col-lg-3
col-sm-6 col-md-4 col-lg-3

col-sm-4
col-sm-8
col-sm-8 col-sm-offset-4

col-sm-6
col-xs-2 col-sm-4
col-xs-10 col-sm-8
col-sm-6