diff --git a/d01/d01_1.awk b/d01/d01_1.awk
index 6c92772..00ad296 100644
--- a/d01/d01_1.awk
+++ b/d01/d01_1.awk
@@ -1,16 +1,4 @@
-NR == 1 {
-	A = $1
-	next
-}
-
-$1 > A {
-	N++
-}
-
-{
-	A = $1
-}
-
-END {
-	print N
-}
\ No newline at end of file
+NR == 1 { A = $1; next }
+$1 > A { N++ }
+{ A = $1 }
+END { print N }
diff --git a/d01/d01_2.py b/d01/d01_2.py
index c74a859..f2393ee 100644
--- a/d01/d01_2.py
+++ b/d01/d01_2.py
@@ -1,3 +1,10 @@
 import sys
 L = [int(l[:-1]) for l in sys.stdin.readlines()]
-print(sum([0,1][a<b] for (a,b) in zip(L, L[3:])))
+print(sum([0,1][a<d] for (a,d) in zip(L, L[3:])))
+
+# window1 = [A,B,C] ; window2 = [B,C,D]
+# sum(Window1) <? sum(window2)
+# (A+B+C) <? (B+C+D)
+# (A+B+C)-B-C <? (B+C+D)-B-C
+# A <? D
+# eg: comparing A+B+C and B+C+D is the same as comparing A and D
diff --git a/sliding.py b/libs/sliding.py
similarity index 100%
rename from sliding.py
rename to libs/sliding.py
diff --git a/uloc.sh b/uloc.sh
new file mode 100755
index 0000000..7195096
--- /dev/null
+++ b/uloc.sh
@@ -0,0 +1,4 @@
+#!/bin/sh -eu
+
+find . -mindepth 2 -type f -and \( -name "*.awk" -or -name "*.py" \) -and -not -path "./libs/*" -print0 \
+| xargs -0 cat | grep -v -E '^#' | sort -u | wc -l