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ttp://res.cloudinary.com/deltatreafcprod/image/upload/mwutetkskc0veuziqpff.pdf

"23.1.2. Registration Window 2: for Participating Clubs entering at the Group Stage, thirty (30) days prior to their first Match of the Group Stage;"

気になるけど、
ＧＳの登録期限は2/14の試合の30日前(1/15)に終わってます。