18 | PRINT m**{1, 2}.
| ^~~~~~
-matrix.sps:19.10-19.12: error: MATRIX: Exponent 1.5 in matrix multiplication is
+matrix.sps:19.10-19.12: error: MATRIX: Exponent 1.5 in matrix exponentiation is
non-integer or outside the valid range.
19 | PRINT m**1.5.
| ^~~