SELECT T1.lot_details FROM LOTS AS T1 JOIN TRANSACTIONS_LOTS AS T2 ON  T1.lot_id  =  T2.transaction_id JOIN TRANSACTIONS AS T3 ON T2.transaction_id  =  T3.transaction_id WHERE T3.share_count  >  100 AND T3.transaction_type_code  =  "PUR"
What are the lot details of lots associated with transactions whose share count is bigger than 100 and whose type code is "PUR"?
[Schema (values) (types)]: | tracking_share_transactions |  Investors : investor_id (text) , investor_details (number) | Lots : lot_id (text) , investor_id (number) , lot_details (text) | Ref_Transaction_Types : transaction_type_code (text) , transaction_type_description (number) | Transactions : transaction_id (text) , investor_id (number) , transaction_type_code (text) , date_of_transaction (number) , amount_of_transaction (number) , share_count (text) , other_details (text) | Sales : sales_transaction_id (text) , sales_details (number) | Purchases : purchase_transaction_id (text) , purchase_details (number) | Transactions_Lots : transaction_id (text) , lot_id (number);