Particle Help On Commands?

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On minecraft, I have this command:
execute @e[name=unknown] ~ ~ ~ particle smoke ~ ~ ~ particle smoke ~ ~ ~ ~ ~ ~ 1 100
What it should do it spawn particles when the fishing rod 'bobber' is but instead I get the error:
[19:52:51] Failed to execute 'particle smoke ~ ~ ~ particle smoke ~ ~ ~ 0 0 0 1 100' as unknown
Any help on fixing my command?
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How do you do particle effects with commands?
The /particle command can be used to create particles. If a player uses the "minimal" particles option in the video settings, some particles may not appear.How do you give yourself particles in Minecraft?
Particle Command in Minecraft Java Edition (PC/Mac)Shoot particles ANY direction | Minecraft command tutorial
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