diff --git a/ledger/register.go b/ledger/register.go
index 09154ab..83c6e9e 100644
--- a/ledger/register.go
+++ b/ledger/register.go
@@ -13,18 +13,41 @@ func RegisterWithContributionPrediction(reg map[string]Balances, windowAsPercent
 	if err != nil {
 		return nil, err
 	}
-	windowDuration := time.Second * time.Duration(float64(slices.Max(times)-slices.Min(times))*windowAsPercentOfTotalDuration)
-	log.Println(windowDuration)
 
-	lastReal := time.Unix(slices.Max(times), 0)
-	lastPredicted := lastReal
-	for lastPredicted.Before(lastReal.Add(windowDuration)) {
-		lastPredicted = lastPredicted.Add(time.Hour * 24 * time.Duration((45 - lastPredicted.Day())))
-		log.Println(lastPredicted)
-	}
+	datesToPredict := func() []string {
+		result := make([]string, 0)
+		windowDuration := time.Second * time.Duration(float64(slices.Max(times)-slices.Min(times))*windowAsPercentOfTotalDuration)
+
+		lastReal := time.Unix(slices.Max(times), 0)
+		lastPredicted := lastReal
+		for lastPredicted.Before(lastReal.Add(windowDuration)) {
+			lastPredicted = lastPredicted.Add(time.Hour * 24 * time.Duration((45 - lastPredicted.Day())))
+			result = append(result, lastPredicted.Format("2006-01"))
+		}
+		return result
+	}()
+	log.Print(datesToPredict)
+
+	namesDatesContributions := func() map[string]map[string]Balances {
+		panic("todo")
+	}()
 
 	result := make(map[string]Balances)
-	return result, io.EOF
+	for name, datesContributions := range namesDatesContributions {
+		result[name] = func() Balances {
+			dates := func() []string {
+				result := make([]string, 0)
+				for k := range datesContributions {
+					result = append(result, k)
+				}
+				return result
+			}()
+			slices.Sort(dates)
+			//var half, threeQuarter, sevenEighths string
+			panic(fmt.Sprint(name, dates))
+		}()
+	}
+	return result, nil
 }
 
 func RegisterWithCompoundingInterestPrediction(reg map[string]Balances, windowAsPercentOfTotalDuration float64, name string, rate float64) (map[string]Balances, error) {