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There are two main types of advertisements— commercial advertisements and     41    service advertisements (PSAs). A commercial advertisement is one which someone has paid for to    42       a product or service. PSAs are often placed for free, and are    43     to educate people about health., safety, or any other issue which affects public    44       .

This   45  will give you some information about RealCine: how it works, why it is better than   46   cinema,

and how it can be used in other ways. I believe you will be     47   by the RealCine experience, and will agree

that this is an extraordinary     48     that must be developed further.

41 public  42 promote  43 intended   44 welfare  45 proposal  46 ordinary  47 amazed  48 technology

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