Branches

Scoreboards:
/scoreboard objectives add random dummy
/scoreboard objectives add breakleaves stat.mineBlock.minecraft.leaves
/scoreboard objectives add breakleaves2 stat.mineBlock.minecraft.leaves2

Commands:
execute @a[score_breakleaves_min=1,score_random_min=1,score_random=4] ~ ~ ~ give @p minecraft:stick 1 0
scoreboard players set @a[score_breakleaves_min=1] breakleaves 0
execute @a[score_breakleaves2_min=1,score_random_min=1,score_random=4] ~ ~ ~ give @p minecraft:stick 1 0
scoreboard players set @a[score_breakleaves2_min=1] breakleaves2 0
/scoreboard players add @a random 1
/scoreboard players set @a[score_random_min=10] random 0