diff --git a/19/19.awk b/19/19.awk
new file mode 100644
index 0000000..72e6314
--- /dev/null
+++ b/19/19.awk
@@ -0,0 +1,44 @@
+function abs(n){
+	return (n>=0) ? n : -n
+}
+
+function diff(s1, s2){
+	split(s1,a1,",")
+	split(s2,a2,",")
+	sr = ""
+	for(i in a1)
+		sr = sr abs(a1[i]-a2[i]) (i<3? "," : "")
+	return sr
+}
+
+function similar(d1, d2){
+	split(d1,a1,",")
+	split(d2,a2,",")
+	if(a1[1]==a2[1] && a1[2]==a2[2] && a1[3]==a2[3]) return 1
+	if(a1[1]==a2[1] && a1[2]==a2[3] && a1[3]==a2[2]) return 2
+	if(a1[1]==a2[2] && a1[2]==a2[1] && a1[3]==a2[3]) return 3
+	if(a1[1]==a2[2] && a1[2]==a2[3] && a1[3]==a2[1]) return 4
+	if(a1[1]==a2[3] && a1[2]==a2[1] && a1[3]==a2[2]) return 5
+	if(a1[1]==a2[3] && a1[2]==a2[2] && a1[3]==a2[1]) return 6
+	return -1
+}
+
+BEGIN{
+
+}
+NR%2==1{
+	s1 = $0
+	next
+}
+
+{
+	r = diff(s1,$0)
+	diffs[++diffsp] = r
+}
+
+END{
+	print diffsp
+	for(i=1; i<diffsp; i++){
+		print diffs[i], diffs[i+1],similar( diffs[i], diffs[i+1] )
+	}
+}
diff --git a/19/Makefile b/19/Makefile
new file mode 100644
index 0000000..3b8de07
--- /dev/null
+++ b/19/Makefile
@@ -0,0 +1,14 @@
+1t:
+	awk -f 19.awk test
+
+1i:
+	awk  -f 19.awk input
+
+2t:
+	awk  -f 19_2.awk test
+
+2i:
+	awk  -f 19_2.awk input
+
+paste:
+	xclip -sel c -o > test