Attachment: Archive with pdf, txt and wsf files

type.inbound
and any(attachments,
        .file_extension in~ $file_extensions_common_archives
        and length(distinct(filter(file.explode(.),
                                   .depth == 1
                                   and .flavors.mime in~ ("application/pdf", "text/plain")
                            ),
                            .flavors.mime
                   )
        ) == 2
        and any(file.explode(.), .depth == 1 and .file_extension == "wsf")
)