Using Umlet, What is the exact formula used to create the M:1 and 1:M lines like this in Properties? When I create the line, it says lt=>. but I need to create those lines.

 

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Customer customer_id first_name last_name Date_of_birth user_name H- assigned to Invoice Invoice_id date_created date shipped subtotal associated with Line_Item item_id name price quantity Customer customer_id first_name last_name Date_of_birth user_name H- assigned to Invoice Invoice_id date_created date shipped subtotal associated with Line_Item item_id name price quantity