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Stage: 4 and 5 Challenge Level: Challenge Level:1
Here are some procedures that might prove helpful:

Alter the parameter :T within BRAN3 and BRAN4 as you think fit.

TO BRAN3 :T
IF 20 > :T [STOP]
FD :T
RT 15
BRAN3 :T - 25
LT 30
BRAN3 :T - 10
RT 15
BK :T
END

Start with BRAN3 140 and explore from there!

TO BRAN4 :T
IF 30 > :T [STOP]
FD :T
RT 30
BRAN4 :T * (.6 + .02 * RANDOM 10)
LT 60
BRAN4 :T * (.6 + .02 * RANDOM 10)
RT 30
BK :T
END

Try BRAN4 180 and explore from there!