| 一级变量 | 二级变量 |
| X1 | X11 X12 X13 X14 X15 X16 |
| X2 | X21 X22 X23 |
| X3 | X31 X32 X33 X34 |
| X4 | X41 X42 |
| X5 | X51 X52 X53 X54 X55 |
| X6 | X61 X62 X63 |
| X7 | X71 X72 X73 |
| X8 | X81 X82 X83 X84 X85 |
| X9 | X91 X92 X9:3 |