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Each of the following illustrate a nested REPEAT.
The first example is for a circle based on squares, the second for hexagons.

Note that for the square the inner REPEAT means you move along six sides. This seems redundant but it is a way to get the turtle to a position which means it is ready to draw the next square.

A similar strategy has been applied to the hexagon pattern with REPEAT 9 not REPEAT 6.

to SQSP

REPEAT 12 [REPEAT 6 [FD 30 RT 90] LT 150]

end

and
to HESP

REPEAT 8 [REPEAT 9 [FD 30 RT 60] LT 135]

end