diff --git a/src/symbols/acme/mod.rs b/src/symbols/acme/mod.rs
index c6390ef..556ec82 100644
--- a/src/symbols/acme/mod.rs
+++ b/src/symbols/acme/mod.rs
@@ -3,7 +3,6 @@ use std::path::{Path, PathBuf};
 
 use crate::command_runner::CommandRunner;
 use crate::command_runner::SetuidCommandRunner;
-use crate::symbols::concat::Concat;
 use crate::symbols::dir::Dir;
 use crate::symbols::file::File;
 use crate::symbols::list::List;
@@ -95,19 +94,4 @@ impl<'a, U: Clone + AsRef<str>, H: AsRef<Path>, C: AsRef<str>, R: CommandRunner>
       AcmeCertChain::new(host, &self.acme_command_runner, root_cert_path),
     ))
   }
-  pub fn get_key_and_cert_bundle<HOST: 'a + Clone + AsRef<str>>(
-    &'a self,
-    host: HOST,
-  ) -> impl Symbol + 'a {
-    List::from((
-      self.get_cert(host.clone()),
-      Concat::new(
-        [
-          format!("/etc/ssl/private/{}.key", host.as_ref()),
-          format!("/etc/ssl/local_certs/{}.chained.crt", host.as_ref()),
-        ],
-        format!("/etc/ssl/private/{}.with_key.crt", host.as_ref()),
-      ),
-    ))
-  }
 }
diff --git a/src/symbols/concat.rs b/src/symbols/concat.rs
deleted file mode 100644
index 186dbcc..0000000
--- a/src/symbols/concat.rs
+++ /dev/null
@@ -1,79 +0,0 @@
-use std::error::Error;
-use std::fmt;
-use std::fs::{metadata, File};
-use std::io::copy;
-use std::marker::PhantomData;
-use std::path::Path;
-
-use crate::resources::Resource;
-use crate::symbols::{Action, OwnedSymbolAction, Symbol, SymbolAction, SymbolRunner};
-
-pub struct Concat<S, D, I> {
-  target: D,
-  sources: S,
-  source_item: PhantomData<I>,
-}
-
-impl<S, D, I> Concat<S, D, I> {
-  pub fn new(sources: S, target: D) -> Self {
-    Self {
-      target,
-      sources,
-      source_item: PhantomData::default(),
-    }
-  }
-}
-
-impl<S: AsRef<[I]>, D: AsRef<Path>, I: AsRef<Path>> Symbol for Concat<S, D, I> {
-  fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
-    let target = self.target.as_ref();
-    if !target.exists() {
-      return Ok(false);
-    }
-    let target_date = metadata(target)?.modified()?;
-    for source in self.sources.as_ref() {
-      if metadata(source)?.modified()? > target_date {
-        return Ok(false);
-      }
-    }
-    Ok(true)
-  }
-
-  fn execute(&self) -> Result<(), Box<dyn Error>> {
-    let mut file = File::create(self.target.as_ref())?;
-    for source in self.sources.as_ref() {
-      copy(&mut File::open(source)?, &mut file)?;
-    }
-    Ok(())
-  }
-
-  fn get_prerequisites(&self) -> Vec<Resource> {
-    let mut r: Vec<Resource> = self
-      .sources
-      .as_ref()
-      .iter()
-      .map(|s| Resource::new("file", s.as_ref().to_str().unwrap()))
-      .collect();
-    if let Some(parent) = self.target.as_ref().parent() {
-      r.push(Resource::new("dir", parent.to_str().unwrap()))
-    }
-    r
-  }
-
-  fn as_action<'a>(&'a self, runner: &'a dyn SymbolRunner) -> Box<dyn Action + 'a> {
-    Box::new(SymbolAction::new(runner, self))
-  }
-
-  fn into_action<'a>(self: Box<Self>, runner: &'a dyn SymbolRunner) -> Box<dyn Action + 'a>
-  where
-    Self: 'a,
-  {
-    Box::new(OwnedSymbolAction::new(runner, *self))
-  }
-}
-
-impl<S, D: AsRef<Path>, I> fmt::Display for Concat<S, D, I> {
-  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
-    write!(f, "Concat {}", self.target.as_ref().display())
-  }
-}
diff --git a/src/symbols/factory.rs b/src/symbols/factory.rs
index 6331ff7..0f54f70 100644
--- a/src/symbols/factory.rs
+++ b/src/symbols/factory.rs
@@ -59,20 +59,9 @@ impl<'b, C: 'b + CommandRunner, P: 'b + Policy> SymbolFactory<'b, C, P> {
     }
   }
 
-  pub fn get_cert<'a, H: 'a + AsRef<str> + Clone>(&'a self, host: H) -> impl Symbol + 'a {
-    self.acme_factory.get_cert(host)
-  }
-
-  pub fn get_key_and_cert_bundle<'a, H: 'a + AsRef<str> + Clone>(
-    &'a self,
-    host: H,
-  ) -> impl Symbol + 'a {
-    self.acme_factory.get_key_and_cert_bundle(host)
-  }
-
-  pub fn get_nginx_acme_server<'a, S: 'a + Symbol>(
-    &'a self,
-    host: &'a str,
+  pub fn get_nginx_acme_server<'a, 'c: 'a, S: 'a + Symbol>(
+    &'c self,
+    host: &'static str,
     nginx_server_symbol: S,
   ) -> impl Symbol + 'a {
     List::from((
@@ -82,7 +71,7 @@ impl<'b, C: 'b + CommandRunner, P: 'b + Policy> SymbolFactory<'b, C, P> {
         ReloadService::new("nginx", self.command_runner),
       ),
       Hook::new(
-        self.get_cert(host),
+        self.acme_factory.get_cert(host),
         ReloadService::new("nginx", self.command_runner),
       ),
     ))
@@ -165,9 +154,9 @@ env[PATH] = /usr/local/bin:/usr/bin:/bin
       root_dir,
       10,
       "
-        location / {
+        location / {{
           try_files         $uri $uri/ /index.php?$args;
-        }
+        }}
       ",
     )
   }
diff --git a/src/symbols/list.rs b/src/symbols/list.rs
index 2df3247..5925971 100644
--- a/src/symbols/list.rs
+++ b/src/symbols/list.rs
@@ -48,8 +48,6 @@ impl Symbol for List<'_> {
     for symbol in &self.symbols {
       if let Some(provides) = symbol.provides() {
         r.extend(provides.into_iter());
-      } else {
-        return None;
       }
     }
     if r.is_empty() {
diff --git a/src/symbols/mod.rs b/src/symbols/mod.rs
index 779d186..8c3150f 100644
--- a/src/symbols/mod.rs
+++ b/src/symbols/mod.rs
@@ -68,7 +68,6 @@ impl<'a, S: Symbol + 'a> Action for OwnedSymbolAction<'a, S> {
 }
 
 pub mod acme;
-pub mod concat;
 pub mod cron;
 pub mod dir;
 pub mod factory;
diff --git a/src/symbols/tls/key.rs b/src/symbols/tls/key.rs
index 70a9b1b..2bd440c 100644
--- a/src/symbols/tls/key.rs
+++ b/src/symbols/tls/key.rs
@@ -54,7 +54,6 @@ impl<C: CommandRunner> Symbol for TlsKey<'_, C> {
         "-text".as_ref(),
       ],
     )?;
-    // FIXME check bytes
     Ok(stdout.ends_with("RSA key ok\n".as_bytes()))
   }