info_tfgrid/heroscript/tfgrid4/book_collections.md

!!mdbook.export 
    title:'TFGrid Internet 4.0' 
    description:'TFGrid V4 mdbook'
    name:'tfgrid4' 
    summary_url:'https://git.ourworld.tf/tfgrid/info_tfgrid/src/branch/main/books/tfgrid4'
    collections:'bestkeptsecret, why, farming_v4, economy, p2p, partners_utilization, solutions, web4, tech, values, problems, dy_intro' 
    production:0 //means we put it in summary