S1: Calcutta unlike other cities keeps its trams.
P: As a result there horrendous congestion.
Q: It was going to be the first in South Asia.
R: They run down the centre of the road.
S: To ease in the city decided to build an underground railway line.
S6: The foundation stone was laid in 1972.
The proper sequence should be:
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Look for cause–effect links and solution statements to arrange sentences correctly.