Write an efficient Oz implementation that is doing a function call for a given actual parameter only once

to change your username, you must:

1) make sure what the username you want to change to is allowed in this community

2) contact a administrator (for example, jaysl)

3) through pm, tell the admin what you want to change to

4) if the username is allowed, it will be changed in a matter of seconds (minutes at most)

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research the organization

compare your skills and qualifications

prepare responses

plan what to wear

plan what to bring

pay attention to non- verbal communication

follow up