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The subway is seen as an essential building block of Vaughan 's future development , and part of York 's long-range plan . The S-CLE is intended to be used as a building block in a broad range of applications , such as data-base query system , machine translation systems , NL front-ends , speech-to-text / text-to-speech systems , and so on . If that building block changes , it could conceivably create flaws in the cell structure . IT will be the major building block for international commerce and for empowering nonstate actors . That variety contributes to the richness of invention the listener feels in the symphony , and the contrast between the two rhythms constitutes an important structural building block of the movement .