consider these four groups "black diamonds";
2-4-6-8
11-13-15-17
20-22-24-26
29-31-33-35
trigger: as one group hit, that single number is bet, as another number hit in that group, that number is also bet and +1u progression....and so on until 4 numbers are bet. stop at any hit or when the cycle ends.
cycles
1 number 36 spins
2 numbers 18 spins
3 numbers 12 spins
4 numbers 9 spins
if 3 numbers are bet for 12 spins without hit. STOP and restart, pick a new trigger (with the same bet in progression)...
numbers tend to repeat, rather than a new number hits
more spins...