Task: Formula-prediction-context (source dataset: enron-random)

You are given an table region extracted from a real Excel spreadsheet, which is centered around a cell called "Target Cell" (labeled as "[Target Cell]" shown in the table below). The table region below includes up to 10 rows above/below the Target Cell, and 10 columns to the left/right of the Target Cell. 

Your task is to analyze the table context surrounding the Target Cell, and predict the most likely Excel formula that should go in the Target Cell. If multiple formulas are possible, choose the most reasonable or commonly used based on context.

1. Please follow the standard formula syntax in Excel, e.g. always begins with an equal sign (=).
2. Base your predicted formula on the surrounding table context, e.g., column headers, annotations, and data values in nearby cells.
3. No explanation — just output the formula itself in a JSON format: {"formula": "your_formula_here"}.

Input Excel Snippet in Markdown format:
|    | A     | B                   | C                  | D        | E                     | F                     | G                     | H                    | I               | J                  | K                  | L                   | M                   | N                     | O                     | P      | Q                 |
|---:|:------|:--------------------|:-------------------|:---------|:----------------------|:----------------------|:----------------------|:---------------------|:----------------|:-------------------|:-------------------|:--------------------|:--------------------|:----------------------|:----------------------|:-------|:------------------|
|  5 | XH    | 5.128982857142857   | 5.2682             | NYMEX    | 5.5268                | 5.027749152542373     | 4.4920879120879125    | 3.980012654924984    | IF-NWPL_ROCKY_M |                    | v                  | 5.24                | 5.295               | -0.054999999999999716 | -0.054999999999999716 |        |                   |
|  6 | J-V   | 4.444367346938775   | 4.4192857142857145 | BASIS    | 1.8600000000000003    | -0.022499999999999964 | -0.019999999999999574 | -0.4089086757990872  | NGI/CHI. GATE   |                    | XH                 | 5.3                 | 5.2682              | 0.031799999999999606  | 0.031799999999999606  |        |                   |
|  7 | x1h2  | 4.0956              | 4.3839999999999995 | SWAP ADJ | 0.0                   | 0.0                   | 0.0                   | 0.0                  | IF-TETCO/STX    |                    | JV01               | 4.44                | 4.4192857142857145  | 0.020714285714285907  | 0.020714285714285907  |        |                   |
|  8 | CAL 1 | 4.563633333333334   | 4.6176666666666675 | VOL ADJ  | 0.0                   | 0.0                   | 0.0                   | 0.0                  | MICH_CG-GD      |                    | XH02               | 4.405               | 4.3839999999999995  | 0.021000000000000796  | 0.021000000000000796  |        |                   |
|  9 | CAL 2 | 3.779333333333333   | 3.883666666666666  | SKEW     | 1.0                   | 1.0                   | 1.0                   | 1.0                  | IF-TRANSCO/Z6   |                    | CAL2               | 3.883666666666666   | 3.883666666666666   | 0.0                   | 0.0                   |        |                   |
| 10 | CAL 3 | 3.3840000000000003  | 3.4158333333333335 | OPT TYPE | 1.0                   | 2.0                   | 2.0                   | 2.0                  | IF-ELPO/PERMIAN |                    | CAL3               | 3.4158333333333335  | 3.4158333333333335  | 0.0                   | 0.0                   |        |                   |
| 11 | CAL 4 | 3.217333333333334   | 3.230833333333333  | STRIKE   | 12.0                  | 3.75                  | 3.5                   | 3.0                  | IF-NNG/VENT     |                    | CAL4               | 3.230833333333333   | 3.230833333333333   | 0.0                   | 0.0                   |        |                   |
| 12 |       |                     |                    | PREMIUM  | 0.06180705537927477   | 0.15710975888610185   | 0.13836013729777855   | 0.27198772819125366  | IF-CIG/RKYMTN   |                    |                    |                     |                     |                       |                       |        |                   |
| 13 |       |                     |                    | DELTA    | 0.07031763811072352   | -0.1507769580745139   | -0.16306776974754067  | -0.2418311454497494  | IF-TETCO/ELA    |                    |                    |                     |                     |                       |                       |        |                   |
| 14 |       | 6.255230125523012   |                    | VEGA     | 0.004459239462914932  | 0.0073937969338879715 | 0.008505283517968887  | 0.012284179189807266 | IF-TENN/LA      | IF-ELPO/PERMIAN    | 15.968719422671311 | 0.1575079336937368  |                     |                       |                       |        |                   |
| 15 |       |                     |                    |          | -0.09530270350682707  |                       | [Target Cell]         |                      | IF-WAHA-TX      | IF-ANR/OK          |                    |                     |                     |                       |                       |        |                   |
| 16 |       |                     |                    |          | -0.2524124623929289   |                       | SETTLE                |                      | IF-TRANSCO/Z6   | NGI-SOCAL          |                    |                     |                     |                       | IF-ELPO/SJ            |        |                   |
| 17 |       | MONTH               | MARKET             | SETTLE   | ADJ.                  | PRICES                | VOL                   | VOL CHANGE           | VOL             | STRADDLE           |                    | EXPIRATION          | RATE                |                       | BASIS                 | ADJ    | SWAP              |
| 18 | 1.0   | 2000-10-01 00:00:00 | 5.31               | 5.295    | -0.054999999999999716 | 5.24                  | 0.48                  | 0.0                  | 0.48            | 0.2966040091853799 | 1.0                | 2000-09-26 00:00:00 | 0.06772051582494604 |                       | -0.6625               | -0.015 | 4.5625            |
| 19 | 2.0   | 2000-11-01 00:00:00 | 5.455              | 5.394    | 0.031799999999999606  | 5.4258                | 0.52                  | 0.0                  | 0.52            | 0.7203872498548236 | 2.0                | 2000-10-26 00:00:00 | 0.06808788935076701 |                       | -0.295                | -0.015 | 5.1158            |
| 20 | 3.0   | 2000-12-01 00:00:00 | 5.52               | 5.495    | 0.031799999999999606  | 5.5268                | 0.5725                | 0.0                  | 0.5725          | 1.0883895356154838 | 3.0                | 2000-11-27 00:00:00 | 0.068102551581873   |                       | -0.22                 | -0.015 | 5.291799999999999 |
| 21 | 4.0   | 2001-01-01 00:00:00 | 5.251              | 5.445    | 0.031799999999999606  | 5.4768                | 0.6075                | 0.0                  | 0.6075          | 1.3516045066193971 | 4.0                | 2000-12-26 00:00:00 | 0.06814656708623801 |                       | -0.2175               | -0.015 | 5.2443            |
| 22 | 5.0   | 2001-02-01 00:00:00 | 5.175              | 5.152    | 0.031799999999999606  | 5.1838                | 0.5975                | 0.0                  | 0.5975          | 1.4318747444694306 | 5.0                | 2001-01-26 00:00:00 | 0.06821458968993901 |                       | -0.2225               | -0.015 | 4.9463            |
| 23 | 6.0   | 2001-03-01 00:00:00 | 0.0                | 4.855    | 0.031799999999999606  | 4.8868                | 0.5375                | 0.0                  | 0.5375          | 1.3317802086288513 | 6.0                | 2001-02-23 00:00:00 | 0.06827602946233902 |                       | -0.295                |        | 4.5918            |
| 24 | 7.0   | 2001-04-01 00:00:00 | 4.56               | 4.55     | 0.020714285714285907  | 4.570714285714286     | 0.435                 | 0.0                  | 0.435           | 1.1001085438722207 | 7.0                | 2001-03-27 00:00:00 | 0.068254674043478   |                       | -0.3                  |        | 4.270714285714286 |
| 25 | 8.0   | 2001-05-01 00:00:00 | 0.0                | 4.445    | 0.020714285714285907  | 4.465714285714286     | 0.3975                | 0.0                  | 0.3975          | 1.049031712505442  | 8.0                | 2001-04-25 00:00:00 | 0.068096132754615   |                       | -0.3                  |        | 4.165714285714286 |



min_row: 5
max_row: 25
min_col: 1
max_col: 17
target_cell_row_idx: 15
target_cell_col_idx: 7
target_cell_value: -0.13362759089347512
formula: =G12-H12