minor improvement for randomization if only using enBlock and InOrder factors.

Source/StudyFrameworkPlugin/Private/SFStudyPhase.cpp

@@ -183,12 +183,15 @@ TArray<USFCondition*> USFStudyPhase::GenerateConditions(int ParticipantSequenceN
 
 
 	// create shuffling of enBlock factor, trivial case ({0}) if we do not have an enBlock factor
+	int OrderNr = ParticipantSequenceNr + PhaseIndex;
 	// we devide the participantNr by NumRandomConditions so we do not progress at the same speed, otherwise for simple setup (2-level enBlock, 2-level Random):
 	// a1 a2 b2 b1
 	// b2 b1 a1 a2 (and then repeating)
 	// in case NumRandomConditions is uneven even devide by 2*NumRandomConditions since we have twice as many rows in the Latin Square
-	const TArray<int> EnBlockLatinSquare = USFStudyFactor::GenerateLatinSquareOrder(
-		ParticipantSequenceNr / (NumRandomConditions*(1 + NumRandomConditions%2)) + PhaseIndex, NumEnBlockLevels);
+	if (NumRandomConditions > 1) {
+		OrderNr = ParticipantSequenceNr / (NumRandomConditions * (1 + NumRandomConditions % 2)) + PhaseIndex;
+	}
+	const TArray<int> EnBlockLatinSquare = USFStudyFactor::GenerateLatinSquareOrder(OrderNr, NumEnBlockLevels);
 
 	for (int EnBlockLevel = 0; EnBlockLevel < NumEnBlockLevels; EnBlockLevel++)
 	{