diff --git a/logique-programmable/exercices/Makefile b/logique-programmable/exercices/Makefile
new file mode 100644
index 0000000..4bce23d
--- /dev/null
+++ b/logique-programmable/exercices/Makefile
@@ -0,0 +1,16 @@
+filename=$(shell basename $(shell pwd))
+timestamp=$(shell date +%Y-%m-%d_%H:%M)
+
+all: snapshot
+
+snapshot: main.tex
+	@latexmk -pdf main.tex >/dev/null 2>&1
+	@if ! cmp --silent build/main.pdf ${filename}_*.pdf; then \
+		touch ${filename}_tmp.pdf; \
+		rm ${filename}*.pdf; \
+		cp build/main.pdf ${filename}_${timestamp}.pdf; \
+		echo "Updated"; \
+	fi
+
+clean:
+	@rm -rf build 2>/dev/null
diff --git a/logique-programmable/exercices/main.tex b/logique-programmable/exercices/main.tex
index 35fdf4f..ea67cc9 100644
--- a/logique-programmable/exercices/main.tex
+++ b/logique-programmable/exercices/main.tex
@@ -74,7 +74,7 @@
 
         \begin{tabularx}{0.7\linewidth}{X|Y|YYY|Y}
             \toprule
-                   & D & C & B & A & H \\
+                   & D & A & B & C & H \\
             \midrule
             0      & 0 & 0 & 0 & 0 & 0 \\
             1      & 0 & 0 & 0 & 1 & 0 \\
@@ -99,7 +99,7 @@
         b/ Exprimer $H(A,B,C,D)$ sous la forme disjonctive.
 
         \begin{equation*}
-            H(A,B,C,D) = \bar{A}BC\bar{D} + \bar{A}B\bar{C}D + AB\bar{C}D + A\bar{B}CD + \bar{A}BCD
+            H(A,B,C,D) = AB\bar{C}\bar{D} + \bar{A}B\bar{C}D + \bar{A}BCD + A\bar{B}CD + AB\bar{C}D
         \end{equation*}
 
     \subsection{Exercice 4}