diff --git a/EvenPerfectBitScanner/CliArguments.cs b/EvenPerfectBitScanner/CliArguments.cs
index e0d1cfd..c5701fd 100644
--- a/EvenPerfectBitScanner/CliArguments.cs
+++ b/EvenPerfectBitScanner/CliArguments.cs
@@ -677,7 +677,7 @@ namespace EvenPerfectBitScanner;
         Console.WriteLine("  --max-prime=<value>    inclusive upper bound for primes from filter files");
         Console.WriteLine("  --increment=bit|add    exponent increment method (default add)");
         Console.WriteLine("  --threads=<value>      number of worker threads");
-S        Console.WriteLine("  --mersenne=pow2mod|incremental|lucas|residue|divisor|bydivisor  Mersenne test method");
+        Console.WriteLine("  --mersenne=pow2mod|incremental|lucas|residue|divisor|bydivisor  Mersenne test method");
         Console.WriteLine("  --bydivisor-k-increment=sequential|pow2groups  k iteration strategy for --mersenne=bydivisor (default sequential)");
         Console.WriteLine("  --bydivisor-special-range=<n>  widen pow2groups special values to +/- n percent (default 0 = points)");
         Console.WriteLine("  --residue-max-k=<value> max k for residue Mersenne test (q = 2*p*k + 1)");
diff --git a/PerfectNumbers.Core/Cpu/MersenneNumberDivisorByDivisorPrimeScanSessionWithTemplate.cs b/PerfectNumbers.Core/Cpu/MersenneNumberDivisorByDivisorPrimeScanSessionWithTemplate.cs
index cd06b14..c88f060 100644
--- a/PerfectNumbers.Core/Cpu/MersenneNumberDivisorByDivisorPrimeScanSessionWithTemplate.cs
+++ b/PerfectNumbers.Core/Cpu/MersenneNumberDivisorByDivisorPrimeScanSessionWithTemplate.cs
@@ -7,6 +7,16 @@ using PerfectNumbers.Core.Gpu.Accelerators;
 using System.Runtime.CompilerServices;
 
 
+#if DivisorSet_Pow2Groups
+using TesterCpu = PerfectNumbers.Core.Cpu.MersenneNumberDivisorByDivisorCpuTesterWithForPow2GroupsDivisorSetForCpuOrder;
+using TesterHybrid = PerfectNumbers.Core.Cpu.MersenneNumberDivisorByDivisorCpuTesterWithForPow2GroupsDivisorSetForHybridOrder;
+using TesterGpu = PerfectNumbers.Core.Cpu.MersenneNumberDivisorByDivisorCpuTesterWithForPow2GroupsDivisorSetForGpuOrder;
+#else
+using TesterCpu = PerfectNumbers.Core.Cpu.MersenneNumberDivisorByDivisorCpuTesterWithForOneByOneDivisorSetForCpuOrder;
+using TesterHybrid = PerfectNumbers.Core.Cpu.MersenneNumberDivisorByDivisorCpuTesterWithForOneByOneDivisorSetForHybridOrder;
+using TesterGpu = PerfectNumbers.Core.Cpu.MersenneNumberDivisorByDivisorCpuTesterWithForOneByOneDivisorSetForGpuOrder;
+#endif
+
 #if DivisorSet_Pow2Groups
 using TesterCpu = PerfectNumbers.Core.Cpu.MersenneNumberDivisorByDivisorCpuTesterWithForPow2GroupsDivisorSetForCpuOrder;
 using TesterHybrid = PerfectNumbers.Core.Cpu.MersenneNumberDivisorByDivisorCpuTesterWithForPow2GroupsDivisorSetForHybridOrder;