digraph "included programs" {
    node [shape=box]

    {
        { "nfsn-dns-a" [URL="nfsn-dns-a"] }
        { "nfsn-dns-mx" [URL="nfsn-dns-mx"] }
        { "nfsn-dns-spf" [URL="nfsn-dns-spf"] }
        { "nfsn-dns-dkim" [URL="nfsn-dns-dkim"] }
        { "nfsn-dns-dmarc" [URL="nfsn-dns-dmarc"] }
    }
    -> { "nfsn-dns-update" [URL="nfsn-dns-update"] }
    -> { "nfsn-send" [URL="nfsn-send"] }

    { "nfsn-dns-certbot" [URL="nfsn-dns-certbot"] }
    -> {
        { "nfsn-dns-certbot-auth" [URL="nfsn-dns-certbot-auth"] }
        { "nfsn-dns-certbot-cleanup" [URL="nfsn-dns-certbot-cleanup"] }
    }
    -> { "nfsn-send" [URL="nfsn-send"] }
}
