Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:

Convert text to sql: What are project ids of projects that have 2 or more corresponding documents? | ref_document_types : document_type_code , document_type_name , document_type_description | ref_budget_codes : budget_type_code , budget_type_description | projects : project_id , project_details | documents : document_id , document_type_code , project_id , document_date , document_name , document_description , other_details | statements : statement_id , statement_details | documents_with_expenses : document_id , budget_type_code , document_details | accounts : account_id , statement_id , account_details | documents.project_id = projects.project_id | documents.document_type_code = ref_document_types.document_type_code | statements.statement_id = documents.document_id | documents_with_expenses.document_id = documents.document_id | documents_with_expenses.budget_type_code = ref_budget_codes.budget_type_code | accounts.statement_id = statements.statement_id | 

### Response:

select _ from _ group by _ having count ( _ ) >= _ | select project_id from documents group by project_id having count ( * ) >= 2