Perhaps you should try some spelling variations:
22programming languages » 3.2programming languages, programming languages, onprogramming language
28electronic computers » electronic computers, electronics computers, optoelectronic computers
programming language » programming languages, program language
electronic computer » electronic computers, electronics computer, electronics computers
2a syntax » a syntax, 2 syntax, la syntax
f syntax » _ syntax, a syntax, 3 syntax

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: %((22programming languages) OR (programming language)) %((28electronic computers) OR (electronic computer))%29 %((2a syntax) OR (f syntax))%22.
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