diff --git a/Cargo.lock b/Cargo.lock
index f456851..24fd51e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,14 +1,32 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "argparse"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "either"
+version = "1.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "itertools"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "loxrust"
 version = "0.1.0"
 dependencies = [
  "argparse 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itertools 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [metadata]
 "checksum argparse 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "3f8ebf5827e4ac4fd5946560e6a99776ea73b596d80898f357007317a7141e47"
+"checksum either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "bb1f6b1ce1c140482ea30ddd3335fc0024ac7ee112895426e0a629a6c20adfe3"
+"checksum itertools 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f56a2d0bc861f9165be4eb3442afd3c236d8a98afd426f65d92324ae1091a484"
diff --git a/Cargo.toml b/Cargo.toml
index 760b51b..c5bb8a2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,4 +4,5 @@ version = "0.1.0"
 authors = ["Matthew Constable <bonsty@gmail.com>"]
 
 [dependencies]
-argparse = "0.2.2"
\ No newline at end of file
+argparse = "0.2.2"
+itertools = "0.8"
\ No newline at end of file