This booklet is an extremely useful material for all people who want to know more about Buddhism.
Is the "an" required?
Thanks.
The "an" is forbidden. "Material" is uncountable in this context, and it is awkward here in any event. "
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The "an" is forbidden. "Material" is uncountable in this context, and it is awkward here in any event. Maybe "This booklet is extremely useful for anyone who wants to know more about Buddhism."