Sidlaw stopped in the doorway and looked at the string of symbols and numbers scrawled across the white board on the opposite wall in multiple colours. He asked, "What are you doing?"
The writer, part way through an equation that was requiring five different colours of white board pen, turned to look at him and answered, "Checking the effect of changing some variables in these equations. I'll clean off the board and put the pens back when I'm done."
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