pound sterling

Deductions

• medium of exchange is for example pound sterling ⇐ (pound sterling is a medium of exchange), (is a is inverse of is for example)
• pound sterling is a medium of exchange ⇐ (currency is subclass of medium of exchange), (pound sterling is a currency)
• currency is for example pound sterling ⇐ (pound sterling is a currency), (is a is inverse of is for example)