diff --git a/q421.txt b/q421.txt
new file mode 100644
index 0000000..fa951cd
--- /dev/null
+++ b/q421.txt
@@ -0,0 +1,4 @@
+ananas cumin vanille:0
+vanille ananas cumin:1
+ananas cumin cumin:1
+vanille:1
diff --git a/q422.txt b/q422.txt
new file mode 100644
index 0000000..a11bb88
--- /dev/null
+++ b/q422.txt
@@ -0,0 +1,5 @@
+fich1:0
+fich2:1
+rep1:1
+:1
+fich1 fich2:0
diff --git a/q423.txt b/q423.txt
new file mode 100644
index 0000000..9104de2
--- /dev/null
+++ b/q423.txt
@@ -0,0 +1,7 @@
+toXtoYto:0
+toYtiX:0
+toXtoYYYto:0
+totoYYYto:1
+toto:1
+totoXY titi:0
+:1