AUDUSD H1 Walk-through of Market Trends

SP = Starting Point
ISL = Initial Structure Low
NSL = New Structure Low
ISH = Initial Structure High
NSH = New Structure High

The most recent structure, be it ISL, ISH, NSL, NSH, its starting point will be known as X, if breaking below and closing below X(on a ISH, NSH condition), ISL is formed; breaking above and closing above of X(on a ISL or NSH), ISH is form.

But breaking below and closing below of ISL, NSL is form; breaking above and closing above ISH, NSH is formed.