How do you spell S-T-R-E-S-S???

S
E
R
I
E
S

S
E
V
E
N

I CANNOT SEEM TO WRAP MY BRAIN AROUND OPTIONS TRADING, MARGIN CALLS, BOND MATURITIES, ETC., ETC., ETC. ! ! !
Why oh why did I not take more math classes in college? It has been far too long since I used basic mathematical logic!