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#### 10.4 descr — Prints a description of current preconditioner

    call prec%descr(info)
    call prec%descr(info,iout, root)

Type:
  Asynchronous.
On Entry
prec
  the preconditioner. Scope: local
  Type: required
  Intent: in.
  Specified as: a preconditioner data structure psb_prec_type.
iout
  output unit. Scope: local
  Type: optional
  Intent: in.
  Specified as: an integer number. Default: default output unit.
root
  Process from which to print Scope: local
  Type: optional
  Intent: in.
  Specified as: an integer number between 0 and np - 1, in which case the specified process will print the description, or -1, in which case all processes will print. Default: 0.
On Return
info
  Error code.
  Scope: local
  Type: required
  Intent: out.
  An integer value; 0 means no error has been detected.

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