diff --git a/include/simulation.h b/include/simulation.h
index bb62391..9192ffd 100644
--- a/include/simulation.h
+++ b/include/simulation.h
@@ -25,15 +25,20 @@
 
 //macro for set variant to vector by variant index
 #define SET_VARIANTS_BITS(VEC, X) { \
-	if      (X == 0) VEC = VARIANTS_BITS_A; \
-	else if (X == 1) VEC = VARIANTS_BITS_B; \
-	else if (X == 2) VEC = VARIANTS_BITS_C; \
-	else if (X == 3) VEC = VARIANTS_BITS_D; \
-	else if (X == 4) VEC = VARIANTS_BITS_E; \
-	else if (X == 5) VEC = VARIANTS_BITS_F; \
-	else if (X == 6) VEC = VARIANTS_BITS_G; \
-	else if (X == 7) VEC = VARIANTS_BITS_H; \
-	else VEC = VARIANTS_BITS_ALL0; \
+	if      (X == 0) SET_VECTOR_TO(VEC, VARIANTS_BITS_A) \
+	else if (X == 1) SET_VECTOR_TO(VEC, VARIANTS_BITS_B) \
+	else if (X == 2) SET_VECTOR_TO(VEC, VARIANTS_BITS_C) \
+	else if (X == 3) SET_VECTOR_TO(VEC, VARIANTS_BITS_D) \
+	else if (X == 4) SET_VECTOR_TO(VEC, VARIANTS_BITS_E) \
+	else if (X == 5) SET_VECTOR_TO(VEC, VARIANTS_BITS_F) \
+	else if (X == 6) SET_VECTOR_TO(VEC, VARIANTS_BITS_G) \
+	else if (X == 7) SET_VECTOR_TO(VEC, VARIANTS_BITS_H) \
+	else SET_VECTOR_TO(VEC, VARIANTS_BITS_ALL0) \
+}
+
+#define SET_VECTOR_TO(VEC, X) { \
+	simulation::io_vector_t tmp = X; \
+	VEC = tmp;\
 }
 
 #include <inttypes.h>
diff --git a/src/main.cpp b/src/main.cpp
index 50133be..9c7057f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -200,11 +200,6 @@ struct cgploss : public Pass {
 					param_l_back = stoi(parsed);
 				}
 
-				if (param_parrents_count < 0) {
-					log("[ERROR] Bad value for l-back, min value is 0. using 0\n");
-					param_l_back = 0;
-				}
-
 			} else {
 				if (param != "cgploss") {
 					log("[WARNING] ignorig argument %s\n", param.c_str());
diff --git a/tests/combinations-generate-unit/test.cpp b/tests/combinations-generate-unit/test.cpp
index 9aa5261..becc888 100644
--- a/tests/combinations-generate-unit/test.cpp
+++ b/tests/combinations-generate-unit/test.cpp
@@ -30,7 +30,7 @@ PRIVATE_NAMESPACE_BEGIN
 void assert(std::string name, simulation::io_t output, unsigned pos, bool inverted = false) {
 	simulation::io_t ref;
 
-	SET_VARIANTS_BITS(ref, pos);
+	SET_VARIANTS_BITS(ref.vec, pos);
 
 	if (inverted) {
 		ref.vec = ~ref.vec;
@@ -74,7 +74,7 @@ struct cgploss : public Pass {
 				log("I%d  - %d - ", j, variant_counter[j]);
 
 				for (unsigned h = 0; h < SIM_BYTES_COUNT; h++) {
-					log("%x", test_circuic[j].byte[h]);
+					log("%02x", test_circuic[j].byte[h]);
 				}
 
 				log("\n");