Further running example
$1000 bank.

$60 / 6 = 10 L
$70 / 7 = 10 L
$80 / 8 = 10 L
$90 / 9 = 10 w 2/1 $20prof
$70 / 7 = 10 w 2/1 $20prof

$50. We are now $10 in profit time to start again at $60 / 6.

Cheers.

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Cheers.