function readOnly(count){ }
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list<list<sobject >> is mainly we use in SOSL query.
for example:-
list<list<sobject>> res=[FIND 'Any string you wanna search' IN ALL FIELDS RETURNING Lead];
You can refer this link for further info:
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/langCon_apex_SOQL.htm