Use 'to check in' and 'a check-in'.
Use 'to check in' and 'a check-in'.

UweTrottmann/SeriesGuide,UweTrottmann/SeriesGuide,r00t-user/SeriesGuide,artemnikitin/SeriesGuide,epiphany27/SeriesGuide,hoanganhx86/SeriesGuide,0359xiaodong/SeriesGuide