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### 8.172 `MERGE_BITS` — Merge of bits under mask

Description:
  `MERGE_BITS(I, J, MASK)` merges the bits of I and J as determined by the mask. The i-th bit of the result is equal to the i-th bit of I if the i-th bit of MASK is 1; it is equal to the i-th bit of J otherwise.
Standard:
  Fortran 2008 and later
Class:
  Elemental function
Syntax:
  `RESULT = MERGE_BITS(I, J, MASK)`
Arguments:

  I | Shall be of type `INTEGER`.
  J | Shall be of type `INTEGER` and of the same kind as I.
  MASK | Shall be of type `INTEGER` and of the same kind as I.

Return value:
  The result is of the same type and kind as I.