Command Randomizer

Repeating Randomizer
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Summon ArmorStands:
/summon ArmorStand ~ ~1 ~ {Small:1b,Marker:1b,CustomName:random_output_01}

Trigger Random Command:
/execute @r[type=ArmorStand,name=random_output_01] ~ ~ ~ setblock ~ ~ ~ redstone_block 0 destroy

Command Block ABOVE ArmorStands:
/setblock ~ ~-1 ~ air




Non-Repeating Randomizer
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Summon ArmorStands:
/summon ArmorStand ~ ~1 ~ {Small:1b,Marker:1b,CustomName:random_output_02}

Trigger Random Command:
/execute @r[type=ArmorStand,name=random_output_02] ~ ~ ~ setblock ~ ~ ~ redstone_block 0 destroy

Command Block ABOVE ArmorStands:
/kill @e[type=ArmorStand,dx=0,dy=-2,dz=0]