Solved TNT explode blocks from list

[Hobbit41]

Minecraft version: 1.8

Hi guys. I have a list where all placed blocks (coordinates of them) by players are stored. When somebody is trying to remove any block not from that list, event is canceled - it works fine.

But now Im trying to create tnt, which when exploded will break ONLY blocks from that list. And I am completely out of ideas. Do you have any?

P.S.: my list named {placedblocks::*}

 

[ShaneBee]

code:
on explode:
----wait 1 tick
----loop exploded blocks:
--------loop {placedblocks::*}:
------------if location of loop-block is loop-value-2:
----------------set block at location of loop-block to air
----------------drop a loop-block at location of loop-block
------------else:
----------------set block at location of loop-block to loop-block

 

[ShaneBee]

code:
on explode:
----wait 1 tick
----loop exploded blocks:
--------loop {placedblocks::*}:
------------if location of loop-block is loop-value-2:
----------------set block at location of loop-block to air
----------------drop a loop-block at location of loop-block
------------else:
----------------set block at location of loop-block to loop-block

no, that's not working.
Every block is being destroyed, placed by players or not.
[doublepost=1503762647,1503159230][/doublepost]bump, still need help
[doublepost=1503784078][/doublepost]Dont know why, but this line of code works fine even if It has 2 "cancel event" in both IF's

on explode:
    {placedblocks::*} is not set:
        cancel event
    else:
        loop exploded blocks:
            loop {placedblocks::*}:
                location of loop-block is equal to loop-value-2:
                    cancel event
                else:
                    cancel event

but if to remove "else" it would break any blocks if in radius are no any placed-by-players block's.