Who trades futures spreads here?

Quote from xty:

I watch the wti/brent spread ...........and intraday (seriously intraday....) this days u will be suprise it goes as far as .75 to 1 US$ during the regular trading session
1-which one is the buy leg?CL or BZ?
2-what is the spread margin for CL, BZ spread?front month...
 
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