diff --git a/lib/aids.klambda b/lib/aids.klambda
index 6309254..a6ba3dc 100644
--- a/lib/aids.klambda
+++ b/lib/aids.klambda
@@ -2,13 +2,5 @@
 : i'm hilarious.
 
 INCLUDE:./loop.klambda
-
-(defun spit
-	(miracle
-		"builtins" "print" (id $1)))
-(defun input
-	(miracle
-		"builtins" "input" ("")))
-(defun thesis
-	(spit
-		("this language belongs to makise kurisu. there are many like it, but this one is hers.")))
\ No newline at end of file
+INCLUDE:./lists.klambda
+INCLUDE:./kokoro.klambda
\ No newline at end of file
diff --git a/lib/kokoro.klambda b/lib/kokoro.klambda
new file mode 100644
index 0000000..a032fd0
--- /dev/null
+++ b/lib/kokoro.klambda
@@ -0,0 +1,9 @@
+(defun spit
+	(miracle
+		"builtins" "print" (id $1)))
+(defun input
+	(miracle
+		"builtins" "input" ("")))
+(defun thesis
+	(spit
+		("this language belongs to makise kurisu. there are many like it, but this one is hers.")))
\ No newline at end of file
diff --git a/lib/lists.klambda b/lib/lists.klambda
new file mode 100644
index 0000000..bc1896f
--- /dev/null
+++ b/lib/lists.klambda
@@ -0,0 +1,3 @@
+(defun length
+	(miracle
+		"builtins" "len" ((id $1))))
\ No newline at end of file