Not sure about the audience of things like these, but this is how I look at charts.
The previous up move ended in a DDIU + a thrust up
The current down move started with a DDID + thrust down = wave 1
…and ended with a DDID + thrust down = wave 3
RSI2[i]<95 && RSI2[i+1]>98 && RSI2[i+2]>98 && RSI2[i+3]>98
RSI2[i]>5 && RSI2[i+1]<2 && RSI2[i+2]<2 && RSI2[i+3]<2
SDU stands for screw driver up, SDD: screw driver down
(they come with their own thrusts as well normally)