Possible Clues:

• Unrestricted, as a mutual fund
• Like some flexible mortgages
• Allowing for modification, as a mortgage
• Like some auto leases
• Without a time limit, as a contract
• Not fixed
• Unrestricted, as mutual funds
• Side of a pillowcase that a pillow goes in
• Like some mortgages
• Not being stuck-up, not so close to being last