It's the EUR/USD, EUR/JPY, USD/JPY, and GBP/CHF.
Based on spreads, I found less than 0.03% to be most acceptable for sharpshooting. There were seven pairs that fit this: the EUR/USD, EUR/JPY, GBP/USD, USD/CHF, USD/JPY, EUR/CHF, and GBP/CHF.
No others were below .043%. From here, the...