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var Closes[100];
vars ClosesCurrent=series(0,-20);

if(Closes[0]<Closes[1] and NumOpenLong<1)
shift(ClosesCurrent, Closes[0],20);
{
enterLong();
}

if(Closes[0]>Closes[1] and NumOpenShort<1)
shift(ClosesCurrent, Closes[0],20);
{
enterShort();
}