Setblock clock with scoreboard doesn't work in Minecraft

I've been trying some things with scoreboard lately and I always get to the point where I need to use the following commands.
/scoreboard players set @a Holding 0
/scoreboard players set @a Holding 1 {DataTag}
/execute @e[score_Holding_min=1] ~ ~ ~ /summon LightningBolt ~ ~ ~
People tell me to connect these to the same setblock clock but in order. I do that this way.
But nothing happens. The problem seems that the Holding score is set back to 0 too fast for the execute command to work. Does anyone know how to make this setup work?
Best Answer
I have already found a solution myself. This is the working setup:
Take note that the Holding 0 block is at the end and that no redstone is on top of it. This worked for me. After reading some comments, it seems that the location of the redstone blocks was the problem. The order in which the commands are executed goes from low to high, so from a low X to a higher X. The same goes for the Y and Z coordinates.
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