In each question, the first and the last sentences of the passage are numbered S1 and S6 respectively. The rest of the passage is split into four parts. These four sentences are jumbled. Read the sentences and identify their correct and logical order.

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S1: Urban problem differ from State to State and city to city.
P: Most of the cities have neither water nor the required pipelines.
Q: The population in these cities has grown beyond the planners imagination.
R: However, certain basic problems are common to all cities.
S: Only broad macro - planning done for such cities, without envisaging the future growth, and this has failed to meet the requirements.
S6: There is no underground drainage system in most cities, and the narrow historical roads are already congested.
The Proper sequence should be: