diff --git a/README.md b/README.md
index 9f06617..c23bb41 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ variety of languages and technologies. These are things that don't really
 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
-_391 TILs and counting..._
+_392 TILs and counting..._
 
 ---
 
@@ -43,6 +43,7 @@ _391 TILs and counting..._
 
 - [Aggregation Using merge-with](clojure/aggregation-using-merge-with.md)
 - [Argument Requirements For A Function](clojure/argument-requirements-for-a-function.md)
+- [Combinations Of Items From A Sequence](clojure/combinations-of-items-from-a-sequence.md)
 - [Evaluate One Liners With lein-exec](clojure/evaluate-one-liners-with-lein-exec.md)
 - [Expanding Macros](clojure/expanding-macros.md)
 - [Get The Value Of An Environment Variable](clojure/get-the-value-of-an-environment-variable.md)
diff --git a/clojure/combinations-of-items-from-a-sequence.md b/clojure/combinations-of-items-from-a-sequence.md
new file mode 100644
index 0000000..412e995
--- /dev/null
+++ b/clojure/combinations-of-items-from-a-sequence.md
@@ -0,0 +1,24 @@
+# Combinations Of Items From A Sequence
+
+Sometimes we want all combinations of items from a list. For instance, we
+may have 5 people and we want to know all the ways that we can unique pair
+up 2 people from that group of 5. What we want is the number of
+combinations of 2 people from the 5.
+
+The
+[clojure/math.combinatorics](https://github.com/clojure/math.combinatorics)
+library provides a `combinations` function that gives us exactly that
+functionality.
+
+```clojure
+(use '[clojure.math.combinatorics :as combo])
+
+(combo/combinations ["Liz", "Tracy", "Kenneth", "Jack", "Jenna"] 2)
+; (("Liz" "Tracy") ("Liz" "Kenneth") ("Liz" "Jack")
+;  ("Liz" "Jenna") ("Tracy" "Kenneth") ("Tracy" "Jack")
+;  ("Tracy" "Jenna") ("Kenneth" "Jack") ("Kenneth" "Jenna")
+;  ("Jack" "Jenna"))
+```
+
+The `combinations` function takes a list of items and then a number for the
+size of the grouping combinations that it is supposed to produce.