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New sequence is as follows:

pr1  qr2  pr3  pq4  qr5  rp6  qq7  rp8  qp9  qr10  qp11  qp12

16th from the right  end is 7

$$\begin{gathered} b w x y z a \\ d s t u v c \\ f o p q r e \end{gathered}$$

There are three ways that can be used in order for a Thread to be created:

A class may extend the Thread class.

A class may implement the Runnable interface.

An application can use the Executor framework, in order to create a thread pool.

The Runnable interface is preferred, as it does not require an object to inherit the Thread class. In case your application design requires multiple inheritance, only interfaces can help you. Also, the thread pool is very efficient and can be implemented and used very easily.

Dynamic method dispatch which is also known as runtime polymorphism is a process in which a call to an overridden method is resolved at runtime rather than at compile-time. In this process, an overridden method is called through the reference variable of a superclass. The determination of the method to be called is based on the object being referred to by the reference variable.

A Monitor defines a lock and condition variables for managing concurrent access to shared data. The monitor uses the lock to ensure that only a single thread inactive in the monitor code at any time.

A monitor allows only one thread to lock an object at once.

In India, National Income is calculated by the combined method. It combines two methods i.e product or output method and the income method. This is done to overcome the problem of deficiency of statistics. The product method endeavours to find out the net contribution to national income of all producing units. The income method adds up income and payments accruing of factors of production. This method is used in the tertiary  sector like government services banking etc and also in the commoity sector if output data is not available.