Strat. 1: VIX and SPY lower, any day Strat. 2: VIX and SPY lower, NOT Friday Strat. 3: VIX and SPY lower, Friday's only Strat. 4: VIX and SPY lower (-0.50% < x < 0%), any day Strat. 5: VIX and SPY lower (-0.50% < x < 0%), Friday's only