Remove repeated word

[BioGeek]

First time contributor checklist

• [x] I have read the README
• [x] I have read the CONTRIBUTING document

Contributor checklist

• [ ] I have branched from the develop branch
• [x] My commits are in nice logical chunks
• [x] My contribution is fully baked and is ready to be merged as is or I have cleanly laid out what this pull request should achieve in the end

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Description

It combines the traditional cluster work, using using the command-line, ... -> It combines the traditional cluster work, using the command-line, ...