tickers = [AAPL, FB, GOOG, YHOO, XRAY, CSCO]
qCodes = [x + 'WIKI/' for x in tickers]
for i in range(0, len(qCodes)):
    ADD TO MYSQLDB->Quandl.get(qCodes[i], collapse='daily', start_date=start, end_date=end)

for x in range(0, len(qCodes)-1):
    for y in range(x+1, len(qCodes)):
        //GET FROM MYSQLDB-> x, y
        //clean(x,y)
        //normalize(x,y)
        //write to csv file->(regression(x,y))