{
  sleepTime ? 3,
}:

with import "${builtins.getEnv "_NIX_TEST_BUILD_DIR"}/config.nix";

let

  mkDrv =
    text: inputs:
    mkDerivation {
      name = "parallel";
      builder = ./parallel.builder.sh;
      inherit
        text
        inputs
        shared
        sleepTime
        ;
    };

  a = mkDrv "a" [ ];
  b = mkDrv "b" [ a ];
  c = mkDrv "c" [ a ];
  d = mkDrv "d" [ a ];
  e = mkDrv "e" [
    b
    c
    d
  ];

in
e