3WCA	Three-way concept analysis
FCA	formal concept analysis
$(G,M,I)$	three-way property oriented concept lattices
$L(G,M,I)$	the concept lattice
$OEPL(G,M,I)$	three-way property oriented concept lattices
$L_o(G,M,I)$	the object oriented concept lattices
$L_{oE}(G,M,I)$	the set of the object oriented concept extents