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batter is the amount of setback.... Most retaining wall blocks that are manufactured are 6 degree setback....there are ways on blocks to make it 0 degree as well...
as for the flagstone, take a 4' level straight up and down and measure over..... at 3' up ist shoud be back a couple - three inches..... as long as it looks good is what counts..... also take the small 'chinkers' to wedge behind/under stone to ensure stability.
good luck
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Sculpting nature with the help of its Creator
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