Update app.py

app.py

@@ -181,7 +181,7 @@ def predict(dim1, dim2):
 
         out += "\n# Step1 (alignment and pre_append with ones)\n" + table1
         out += (
-            "\n# Step2 (susbtitute columns that have 1 with concat)\nexcept for last 2 dimensions\n"
+            "\n# Step2 (substitute columns that have 1 with concat)\nexcept for last 2 dimensions\n"
             + table2
         )
         out += "\n# Step3 (check if matrix multiplication is valid)\n"