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Subroutine free

`call p%free(p,info)`

This routine deallocates the preconditioner data structure `p`.

Arguments

`info` | `integer, intent(out)`.
| Error code. If no error, 0 is returned. See Section 8 for details.

For compatibility with the previous versions of MLD2P4, this routine can be also invoked as follows:

`call mld_precfree(p,info)`