php - get next/prev only parent posts -


how should parent posts of custom post type projects prev/next posts (good if possible make recursively)

for example have 3 parent posts , childs

post 1      child 1     child 2 post 2     child 3     child 4     child 5 post 3

and want 3 (maybe more) posts turning recursively

ps. have current post id, if helps


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