Task: Schema-Matching (source dataset: assays)

Task: 
Please identify the matching columns between Table A and Table B. For each column in Table A, specify the corresponding column in Table B. If a column in A has no corresponding column in Table B, you can map it to null. Represent each column mapping using a pair of column headers in a list, i.e., [Table A Column, Table B column or null]. Provide the mapping for each column in Table A and return all mappings in a list.

No explanation and return the matching columns in a structured JSON format: {"column_mappings": <a list of column pairs>}.

TableA:
|   assay_id |   src_id | assay_tax_id   | assay_cell_type   | relationship_type   | curated_by   |   doc_id | description                                                                                                 | assay_type   | assay_test_type   | assay_category   | assay_organism   | assay_strain   | assay_tissue   |
|-----------:|---------:|:---------------|:------------------|:--------------------|:-------------|---------:|:------------------------------------------------------------------------------------------------------------|:-------------|:------------------|:-----------------|:-----------------|:---------------|:---------------|
|          1 |        1 |                |                   | H                   | Autocuration |    11087 | The compound was tested for the in vitro inhibition of platelet 12-lipoxygenase at a concentration of 30 uM | B            |                   |                  |                  |                |                |
|          2 |        1 |                |                   | U                   | Autocuration |      684 | Compound was evaluated for its ability to mobilize calcium in 1321NI cells                                  | F            |                   |                  |                  |                |                |
|          3 |        1 |                |                   | U                   | Autocuration |    15453 |                                                                                                             | B            |                   |                  |                  |                |                |
|          4 |        1 | 9913.0         |                   | H                   | Autocuration |    17841 | Binding affinity against A2 adenosine receptor in bovine striatal membranes using [3H]CGS-21680             | B            |                   |                  | Bos taurus       |                |                |
|          5 |        1 | 9606.0         | 143B              | N                   | Intermediate |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |                   |                  | Homo sapiens     |                |                |
|          6 |        1 | 9606.0         | 143B              | N                   | Intermediate |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |                   |                  | Homo sapiens     |                |                |
|          7 |        1 | 10090.0        | 143B              | N                   | Intermediate |    13799 | Cytotoxic Activity was evaluated against 143B (TK-) tumor cells                                             | F            |                   |                  | Mus musculus     |                |                |
|          8 |        1 | 9606.0         | 143B              | N                   | Expert       |    17774 | In vitro cell cytotoxicity was determined against 143B cell line                                            | F            |                   |                  | Homo sapiens     |                |                |
|          9 |        1 | 9606.0         | 143B              | N                   | Intermediate |     3801 | Inhibitory activity against tumor osteosarcoma cell line 143B after 72 hr continuous exposure to compound   | F            |                   |                  | Homo sapiens     |                |                |
|         10 |        1 | 9606.0         | 143B              | N                   | Intermediate |    17430 | In vitro cell cytotoxicity against 143B-LTK cell lines expressed in HSV-1 TK                                | F            |                   |                  | Homo sapiens     |                |                |

TableB:
|   ASSI |   SI |   ASSTI | ASCT   | RELAT   | CUB          | ASSUBCELFR   |     T |   CONFISC | SRASI   | CHI          | CI   | BAFOR       | TII    | VARI   |
|-------:|-----:|--------:|:-------|:--------|:-------------|:-------------|------:|----------:|:--------|:-------------|:-----|:------------|:-------|:-------|
|   7524 |    1 |   10116 |        | N       | Intermediate |              | 50597 |         1 |         | CHEMBL618647 |      | BAO_0000218 | 2113.0 |        |
|   7525 |    1 |   10116 |        | N       | Intermediate |              | 50597 |         1 |         | CHEMBL618648 |      | BAO_0000218 | 2113.0 |        |
|   7526 |    1 |   10116 |        | N       | Intermediate |              | 50597 |         1 |         | CHEMBL618649 |      | BAO_0000218 | 2113.0 |        |
|   7527 |    1 |   10116 |        | N       | Intermediate |              | 50597 |         1 |         | CHEMBL618650 |      | BAO_0000218 | 2107.0 |        |
|   7528 |    1 |   10116 |        | N       | Intermediate |              | 50597 |         1 |         | CHEMBL618651 |      | BAO_0000218 | 2107.0 |        |
|   7529 |    1 |   10116 |        | N       | Intermediate |              | 50597 |         1 |         | CHEMBL876497 |      | BAO_0000218 | 2107.0 |        |
|   7530 |    1 |   10116 |        | N       | Intermediate |              | 50597 |         1 |         | CHEMBL618652 |      | BAO_0000218 | 2048.0 |        |
|   7531 |    1 |   10116 |        | N       | Intermediate |              | 50597 |         1 |         | CHEMBL618653 |      | BAO_0000218 | 2048.0 |        |
|   7532 |    1 |   10116 |        | N       | Intermediate |              | 50597 |         1 |         | CHEMBL618654 |      | BAO_0000218 | 2048.0 |        |
|   7533 |    1 |   10116 |        | N       | Intermediate |              | 50597 |         1 |         | CHEMBL618655 |      | BAO_0000218 |        |        |



source_headers: assay_id
src_id
assay_tax_id
assay_cell_type
relationship_type
curated_by
target_headers: ASSI
SI
ASSTI
ASCT
RELAT
CUB
column_mappings: assay_id
ASSI
src_id
SI
assay_tax_id
ASSTI
assay_cell_type
ASCT
relationship_type
RELAT
curated_by
CUB
output: {"column_mappings": [["assay_id", "ASSI"], ["src_id", "SI"], ["assay_tax_id", "ASSTI"], ["assay_cell_type", "ASCT"], ["relationship_type", "RELAT"], ["curated_by", "CUB"], ["doc_id", null], ["description", null], ["assay_type", null], ["assay_test_type", null], ["assay_category", null], ["assay_organism", null], ["assay_strain", null], ["assay_tissue", null]]}