Firewords are Fireworks which display words in the night sky. You can buy Firewords to make any word but the cost depends on the letters in the word.
A costs 1p, B costs 2p etc.
Which Firewords will cost exactly £1 ?
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Now the prices of the letters are defined by prime numbers (A = 2, B = 3, C = 5 etc) and the price of a word is the product of the letters it contains.
For example the word BAD costs 3 × 2 × 7 = 42p.
What mathematical words might cost:
Fireworks sound effect is by email@example.com