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/usr/share/singular/LIB/ncall.lib is in singular-data 1:4.1.0-p3+ds-2build1.

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The actual contents of the file can be viewed below.

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//////////////////////////////////////////////////////////////////////////////
version="version ncall.lib 4.0.0.0 Jun_2013 "; // $Id: 378f3411e490f1857e026a7d4bf01854b9e16c29 $
category = "Noncommutative";
info="
LIBRARY:  ncall.lib   Load all noncommutative libraries

@format
  central.lib:     Computation of central elements of G- and GR-algebras
  ncalg.lib:       Definitions of important GR-algebras
  ncdecomp.lib:    Central character decomposition of a module
  nctools.lib:     General tools for noncommutative algebras
  gkdim.lib:       Procedures for calculating the Gelfand-Kirillov dimension
  qmatrix.lib:     Quantum matrices, quantum minors and symmetric groups
  involut.lib:     Computations and operations with involutions
  perron.lib:      Computation of algebraic dependences
@end format
";

//  nchomolog.lib:   Noncommutative homological algebra
///////////////////////////////////////////////////////////////////////////////

LIB "central.lib";
LIB "ncalg.lib";
LIB "ncdecomp.lib";
LIB "nctools.lib";
LIB "gkdim.lib";
LIB "qmatrix.lib";
LIB "involut.lib";
LIB "dmod.lib";
LIB "perron.lib";
//LIB "nchomolog.lib";