I always used these methods and successful 80% of the time

1. Remove the combos that have the same sum of midday and evening.

2. remove the combos that have the mirror sum to the midday and evening.

3. Remove the combos that have two digit MIRROR return to the midday and evening.

4. removing the combos that have the sum of the day

These r successful to 90% of the time..

i use many other methods depending on the recent draw numbers..