Legit LGCs [Trader_xB concept]

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Hi.

Firstly, rules for this script (in the future I will make it possible to choose how many candles do you want to lookback for 'strong LGCs'). For now, rules are:

1. Weak LGC:
-Just identifies gap candle:
Bullish high (previous candle) < low (after candle)
Bearish low (previous candle) > high (after candle)

2. Strong LGC:
-Makes sure the gap is not engulfed by 4 candles preceeding it and 2 candles after it
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