diff --git a/grow/definition.go b/grow/definition.go
index deeaa3d..1efa7d6 100644
--- a/grow/definition.go
+++ b/grow/definition.go
@@ -4,6 +4,9 @@ import "io"
 
 import "gopkg.in/yaml.v2"
 
+import "github.com/firestuff/subcoding/gen"
+import "github.com/firestuff/subcoding/vm"
+
 type Definition struct {
 	GlobalMemorySize   uint64    `yaml:"global_memory_size"`
 	FunctionMemorySize uint64    `yaml:"function_memory_size"`
@@ -24,3 +27,61 @@ func NewDefinition(r io.Reader) (*Definition, error) {
 
 	return def, nil
 }
+
+func (def *Definition) Grow(statusChan chan<- Status) (*vm.Program, error) {
+	status := Status{
+		TargetScore: uint64(len(def.Samples)),
+	}
+
+	if statusChan != nil {
+		statusChan <- status
+	}
+
+	// TODO: Score should be number of output criteria, not number of Samples
+	for {
+		status.Attempts++
+
+		prog := gen.RandProgram(def.GlobalMemorySize, def.FunctionMemorySize, def.InstructionLimit)
+
+		score, err := def.Score(prog)
+		if err != nil {
+			close(statusChan)
+			return nil, err
+		}
+
+		if score > status.BestScore {
+			status.BestScore = score
+			status.BestProgram = prog
+
+			if statusChan != nil {
+				statusChan <- status
+			}
+
+			if status.BestScore == status.TargetScore {
+				close(statusChan)
+				return prog, nil
+			}
+		}
+	}
+}
+
+func (def *Definition) Score(prog *vm.Program) (uint64, error) {
+	score := uint64(0)
+
+	for _, sample := range def.Samples {
+		state, err := vm.NewState(prog)
+		if err != nil {
+			return 0, err
+		}
+
+		sample.SetInputs(state)
+
+		state.Execute() // ignore error
+
+		if sample.OutputsMatch(state) {
+			score += 1
+		}
+	}
+
+	return score, nil
+}
diff --git a/grow/grow.go b/grow/grow.go
deleted file mode 100644
index 1d93bdd..0000000
--- a/grow/grow.go
+++ /dev/null
@@ -1,62 +0,0 @@
-package grow
-
-import "github.com/firestuff/subcoding/gen"
-import "github.com/firestuff/subcoding/vm"
-
-func (def *Definition) Grow(statusChan chan<- Status) (*vm.Program, error) {
-	status := Status{
-		TargetScore: uint64(len(def.Samples)),
-	}
-
-	if statusChan != nil {
-		statusChan <- status
-	}
-
-	// TODO: Score should be number of output criteria, not number of Samples
-	for {
-		status.Attempts++
-
-		prog := gen.RandProgram(def.GlobalMemorySize, def.FunctionMemorySize, def.InstructionLimit)
-
-		score, err := def.Score(prog)
-		if err != nil {
-			close(statusChan)
-			return nil, err
-		}
-
-		if score > status.BestScore {
-			status.BestScore = score
-			status.BestProgram = prog
-
-			if statusChan != nil {
-				statusChan <- status
-			}
-
-			if status.BestScore == status.TargetScore {
-				close(statusChan)
-				return prog, nil
-			}
-		}
-	}
-}
-
-func (def *Definition) Score(prog *vm.Program) (uint64, error) {
-	score := uint64(0)
-
-	for _, sample := range def.Samples {
-		state, err := vm.NewState(prog)
-		if err != nil {
-			return 0, err
-		}
-
-		sample.SetInputs(state)
-
-		state.Execute() // ignore error
-
-		if sample.OutputsMatch(state) {
-			score += 1
-		}
-	}
-
-	return score, nil
-}