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Could not find the Pillars described as such, but see they are a well-known concept. I found them referenced in Langar. This should be reviewed, by a more domain-knowledgeable editor (i.e. a Sikh). I have relied upon SikhiWiki, which had more information on it, and with which more extensive cross-fertilization should be considered. I notice they are not mentioned as such in the main article, which seems odd.
My apologies for any errors I may have made, or controversies I might have unwittingly stumbled into.