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I created two haikus using upside down calculators.
Hellish shoe is beige
You can form words with a calculator by entering numbers and then turning the calculator upside down. Each number except nine corresponds to a letter.
Figure out the word you want to spell using these letters and then key in the numbers in reverse order. For example, to spell HELL use the number 7734. To make a word that ends in O you must use a decimal. For example, to spell HELLO you use the number 0.7734.
The calculator vocabulary is rather limited. I have come up with 118 words. I wrote a program to search the dictionary and select words that can be spelled using the letters that can be formed on a calculator. Among these are such choice words as gigolo, besiege, and ghee.