diff --git a/spot/twaalgos/aiger.cc b/spot/twaalgos/aiger.cc
index 8b9aaba66..983113c2e 100644
--- a/spot/twaalgos/aiger.cc
+++ b/spot/twaalgos/aiger.cc
@@ -228,14 +228,20 @@ namespace
         }
       }
     }
-    if ((not input_names.empty()) && (input_names.size() != nb_inputs))
-      error_aig(__LINE__, "Either all or none of the inputs can be named",
-                0);
+    if (!input_names.empty())
+    {
+      if (input_names.size() != nb_inputs)
+        error_aig(__LINE__, "Either all or none of the inputs can be named",
+                  0);
+    }
     else
       input_names = name_vector(nb_inputs, "i");
-    if ((not output_names.empty()) && (output_names.size() != nb_outputs))
+    if (!output_names.empty())
+    {
+      if (output_names.size() != nb_outputs)
       error_aig(__LINE__, "Either all or none of the outputs can be named",
                 0);
+    }
     else
       output_names = name_vector(nb_outputs, "o");
 
diff --git a/tests/python/aiger.py b/tests/python/aiger.py
index 6938d0703..edf7e1563 100644
--- a/tests/python/aiger.py
+++ b/tests/python/aiger.py
@@ -3383,6 +3383,24 @@ for (i, e_latch) in zip(ins, exp_latches):
               (aig.circ_state()[4], aig.circ_state()[6]))
     aig.circ_step([i])
 
+# Variable names
 
+assert(spot.aiger_circuit("""aag 2 2 0 2 0
+2
+4
+2
+1
+i0 a
+i1 b
+c
+""").to_str() == 'aag 2 2 0 2 0\n2\n4\n2\n1\ni0 a\ni1 b\no0 o0\no1 o1')
 
-
+assert(spot.aiger_circuit("""aag 2 2 0 2 0
+2
+4
+2
+1
+o0 x
+o1 y
+c
+""").to_str() == 'aag 2 2 0 2 0\n2\n4\n2\n1\ni0 i0\ni1 i1\no0 x\no1 y')
diff --git a/tests/python/synthesis.ipynb b/tests/python/synthesis.ipynb
index 5e29b62e4..ce1e98e14 100644
--- a/tests/python/synthesis.ipynb
+++ b/tests/python/synthesis.ipynb
@@ -3,7 +3,6 @@
   {
    "cell_type": "code",
    "execution_count": 1,
-   "id": "acbc10d9",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -13,7 +12,6 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9a6831b2",
    "metadata": {},
    "source": [
     "This notebook presents functions that can be used to solve the Reactive Synthesis problem using games.\n",
@@ -37,7 +35,6 @@
   {
    "cell_type": "code",
    "execution_count": 2,
-   "id": "eb46d524",
    "metadata": {},
    "outputs": [
     {
@@ -54,649 +51,649 @@
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     "Solving the game, is done with `solve_game()` as with any game.  There is also a version that takes a `synthesis_info` as second argument in case the time it takes has to be recorded.  Here passing `si` or not makes no difference."
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   {
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     "# Converting the strategy to AIGER\n",
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   {
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       "text/plain": [
-       "<spot.aig; proxy of <Swig Object of type 'spot::aig_ptr *' at 0x7f6c004d8870> >"
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     "While we are at it, let us mention that you can render those circuits horizontally as follows:"
@@ -3151,7 +3138,6 @@
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     "# Adding more inputs and outputs by force"
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     "It can happen that propositions declared as output are ommited in the aig circuit (either because they are not part of the specification, or because they do not appear in the winning strategy).  In that case those \n",
@@ -3247,7 +3231,6 @@
   {
    "cell_type": "code",
    "execution_count": 9,
-   "id": "efc7c557",
    "metadata": {},
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