diff --git a/src/QSymbolicsBase/predefined.jl b/src/QSymbolicsBase/predefined.jl
index 0cae6e0..19452b7 100644
--- a/src/QSymbolicsBase/predefined.jl
+++ b/src/QSymbolicsBase/predefined.jl
@@ -216,7 +216,11 @@ julia> MixedState(X1⊗X2)
 
 julia> express(MixedState(X1⊗X2))
 Operator(dim=4x4)
-  basis: [Spin(1/2) ⊗ Spin(1/2)]sparse([1, 2, 3, 4], [1, 2, 3, 4], ComplexF64[0.25 + 0.0im, 0.25 + 0.0im, 0.25 + 0.0im, 0.25 + 0.0im], 4, 4)
+  basis: [Spin(1/2) ⊗ Spin(1/2)]
+ 0.25+0.0im   0.0+0.0im   0.0+0.0im   0.0+0.0im
+  0.0+0.0im  0.25+0.0im   0.0+0.0im   0.0+0.0im
+  0.0+0.0im   0.0+0.0im  0.25+0.0im   0.0+0.0im
+  0.0+0.0im   0.0+0.0im   0.0+0.0im  0.25+0.0im
 
 julia> express(MixedState(X1⊗X2), CliffordRepr())
 𝒟ℯ𝓈𝓉𝒶𝒷