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A missing solution is a valid one which is lost during the solution process. Both situations frequently result from performing operations that are not invertible for some or all values of the variables involved, which prevents the chain of logical implications from being bidirectional.
The ICSE Examination is a school examination and the standard of the examination pre-supposes a school course of ten years duration (Classes I-X). The Indian Certificate of Secondary Education Examination will ensure a general education and all candidates are required to enter for six or more subjects and Socially Useful Productive Work (SUPW).
On an 8×8 board one can place 32 knights, or 14 bishops, 16 kings or 8 rooks, so that no two pieces attack each other. In the case of knights, an easy solution is to place one on each square of a given color, since they move only to the opposite color. The solution is also easy for rooks and kings.