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Irish, Italians, Polish, Germans, English, and Greeks are the largest ethnic European groups in the city. Philadelphia has the second-largest Irish and Italian populations in the United States, after New York City. South Philadelphia remains one of the largest Italian neighborhoods in the country and is home to the Italian Market. The Pennsport neighborhood and Gray's Ferry section of South Philadelphia, home to many Mummer clubs, are well known as Irish neighborhoods. The Kensington section, Port Richmond, and Fishtown have historically been heavily Irish and Polish. Port Richmond is well known in particular as the center of the Polish immigrant and Polish-American community in Philadelphia, and it remains a common destination for Polish immigrants. Northeast Philadelphia, although known for its Irish and Irish-American population, is also home to a large Jewish and Russian population. Mount Airy in Northwest Philadelphia also contains a large Jewish community, while nearby Chestnut Hill is historically known as an Anglo-Saxon Protestant stronghold.

Which three areas are high in Irish and Polish?
Answer: Kensington section, Port Richmond, and Fishtown
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Phonetically in some languages, such as Navajo, aspiration of stops tends to be realised as voiceless velar airflow; aspiration of affricates is realised as an extended length of the frication.

Aspiration of stops is seen as voiceless velar airflow in some languages, such as what?
Answer: Navajo
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Regression testing focuses on finding defects after a major code change has occurred. Specifically, it seeks to uncover software regressions, as degraded or lost features, including old bugs that have come back. Such regressions occur whenever software functionality that was previously working correctly, stops working as intended. Typically, regressions occur as an unintended consequence of program changes, when the newly developed part of the software collides with the previously existing code. Common methods of regression testing include re-running previous sets of test-cases and checking whether previously fixed faults have re-emerged. The depth of testing depends on the phase in the release process and the risk of the added features. They can either be complete, for changes added late in the release or deemed to be risky, or be very shallow, consisting of positive tests on each feature, if the changes are early in the release or deemed to be of low risk. Regression testing is typically the largest test effort in commercial software development, due to checking numerous details in prior software features, and even new software can be developed while using some old test-cases to test parts of the new design to ensure prior functionality is still supported.

Finding defects once a change in code had already happened is called?
Answer:
Regression testing