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 | assay_test_type   |   src_id |   confidence_score | cell_id   | assay_cell_type   | assay_tissue   | chembl_id    | variant_id   |    tid | tissue_id   | assay_strain   | assay_category   | src_assay_id   | relationship_type   | bao_format   |   doc_id | description                                                                                                 | assay_type   |
|-----------:|:------------------|---------:|-------------------:|:----------|:------------------|:---------------|:-------------|:-------------|-------:|:------------|:---------------|:-----------------|:---------------|:--------------------|:-------------|---------:|:------------------------------------------------------------------------------------------------------------|:-------------|
|          1 |                   |        1 |                  8 |           |                   |                | vHEMfL615117 |              |  12052 |             |                |                  |                | H                   | BAl9000019   |    11087 | The compound was tested for the in vitro inhibition of platelet 12-lipoxygenase at a concentration of 30 uM | B            |
|          2 |                   |        1 |                  0 |           |                   |                | CH3MBL6151q8 |              |  22226 |             |                |                  |                | U                   | BAO00o021o   |      684 | Compound was evaluated for its ability to mobilize calcium in 1321NI cells                                  | F            |
|          3 |                   |        1 |                  0 |           |                   |                | fHEMBL6w5119 |              |  22226 |             |                |                  |                | U                   | BAO90000q9   |    15453 |                                                                                                             | B            |
|          4 |                   |        1 |                  4 |           |                   |                | Cg2MBL615120 |              | 104729 |             |                |                  |                | H                   | BAO0000w40   |    17841 | Binding affinity against A2 adenosine receptor in bovine striatal membranes using [3H]CGS-21680             | B            |
|          5 |                   |        1 |                  1 | 552.0     | 143B              |                | CH2MBk615121 |              |  80001 |             |                |                  |                | N                   | BA800002w9   |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |
|          6 |                   |        1 |                  1 | 495.0     | 143B              |                | CHEMBL61522w |              |  80001 |             |                |                  |                | N                   | BAO000o229   |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |
|          7 |                   |        1 |                  1 | 767.0     | 143B              |                | sHEMBL616123 |              |  80001 |             |                |                  |                | N                   | hAO0000210   |    13799 | Cytotoxic Activity was evaluated against 143B (TK-) tumor cells                                             | F            |
|          8 |                   |        1 |                  1 | 462.0     | 143B              |                | CHEMBL61513r |              |  80001 |             |                |                  |                | N                   | BAO000o119   |    17774 | In vitro cell cytotoxicity was determined against 143B cell line                                            | F            |
|          9 |                   |        1 |                  1 | 288.0     | 143B              |                | CHEMBL615qw5 |              |  80001 |             |                |                  |                | N                   | BsOp000219   |     3801 | Inhibitory activity against tumor osteosarcoma cell line 143B after 72 hr continuous exposure to compound   | F            |
|         10 |                   |        1 |                  1 | 314.0     | 143B              |                | CHfMhL615126 |              |  80001 |             |                |                  |                | N                   | BA00p00219   |    17430 | In vitro cell cytotoxicity against 143B-LTK cell lines expressed in HSV-1 TK                                | F            |

TableB:
|   assays_assay_id | assays_assay_test_type   |   assays_src_id |   assays_confidence_score | assays_cell_id   | assays_assay_cell_type   | assays_assay_tissue   | assays_chembl_id   | assays_variant_id   |   assays_tid | assays_tissue_id   | assays_assay_strain   | assays_assay_category   | assays_src_assay_id   | assays_relationship_type   | assays_bao_format   | assays_assay_organism   |   assays_assay_tax_id | assays_assay_subcellular_fraction   | assays_curated_by   |
|------------------:|:-------------------------|----------------:|--------------------------:|:-----------------|:-------------------------|:----------------------|:-------------------|:--------------------|-------------:|:-------------------|:----------------------|:------------------------|:----------------------|:---------------------------|:--------------------|:------------------------|----------------------:|:------------------------------------|:--------------------|
|              7524 | In vivo                  |               1 |                         1 |                  |                          | Kidney                | CHEMBL618647       |                     |        50597 | 2113.0             |                       |                         |                       | N                          | BAO_0000218         | Rattus norvegicus       |                 10116 |                                     | Intermediate        |
|              7525 | In vivo                  |               1 |                         1 |                  |                          | Kidney                | CHEMBL618648       |                     |        50597 | 2113.0             |                       |                         |                       | N                          | BAO_0000218         | Rattus norvegicus       |                 10116 |                                     | Intermediate        |
|              7526 | In vivo                  |               1 |                         1 |                  |                          | Kidney                | CHEMBL618649       |                     |        50597 | 2113.0             |                       |                         |                       | N                          | BAO_0000218         | Rattus norvegicus       |                 10116 |                                     | Intermediate        |
|              7527 | In vivo                  |               1 |                         1 |                  |                          | Liver                 | CHEMBL618650       |                     |        50597 | 2107.0             |                       |                         |                       | N                          | BAO_0000218         | Rattus norvegicus       |                 10116 |                                     | Intermediate        |
|              7528 | In vivo                  |               1 |                         1 |                  |                          | Liver                 | CHEMBL618651       |                     |        50597 | 2107.0             |                       |                         |                       | N                          | BAO_0000218         | Rattus norvegicus       |                 10116 |                                     | Intermediate        |
|              7529 | In vivo                  |               1 |                         1 |                  |                          | Liver                 | CHEMBL876497       |                     |        50597 | 2107.0             |                       |                         |                       | N                          | BAO_0000218         | Rattus norvegicus       |                 10116 |                                     | Intermediate        |
|              7530 | In vivo                  |               1 |                         1 |                  |                          | Lung                  | CHEMBL618652       |                     |        50597 | 2048.0             |                       |                         |                       | N                          | BAO_0000218         | Rattus norvegicus       |                 10116 |                                     | Intermediate        |
|              7531 | In vivo                  |               1 |                         1 |                  |                          | Lung                  | CHEMBL618653       |                     |        50597 | 2048.0             |                       |                         |                       | N                          | BAO_0000218         | Rattus norvegicus       |                 10116 |                                     | Intermediate        |
|              7532 | In vivo                  |               1 |                         1 |                  |                          | Lung                  | CHEMBL618654       |                     |        50597 | 2048.0             |                       |                         |                       | N                          | BAO_0000218         | Rattus norvegicus       |                 10116 |                                     | Intermediate        |
|              7533 |                          |               1 |                         1 |                  |                          |                       | CHEMBL618655       |                     |        50597 |                    |                       |                         |                       | N                          | BAO_0000218         | Rattus norvegicus       |                 10116 |                                     | Intermediate        |



source_headers: assay_id
assay_test_type
src_id
confidence_score
cell_id
assay_cell_type
assay_tissue
chembl_id
variant_id
tid
tissue_id
assay_strain
assay_category
src_assay_id
relationship_type
bao_format
target_headers: assays_assay_id
assays_assay_test_type
assays_src_id
assays_confidence_score
assays_cell_id
assays_assay_cell_type
assays_assay_tissue
assays_chembl_id
assays_variant_id
assays_tid
assays_tissue_id
assays_assay_strain
assays_assay_category
assays_src_assay_id
assays_relationship_type
assays_bao_format
column_mappings: assay_id
assays_assay_id
assay_test_type
assays_assay_test_type
src_id
assays_src_id
confidence_score
assays_confidence_score
cell_id
assays_cell_id
assay_cell_type
assays_assay_cell_type
assay_tissue
assays_assay_tissue
chembl_id
assays_chembl_id
variant_id
assays_variant_id
tid
assays_tid
tissue_id
assays_tissue_id
assay_strain
assays_assay_strain
assay_category
assays_assay_category
src_assay_id
assays_src_assay_id
relationship_type
assays_relationship_type
bao_format
assays_bao_format
output: {"column_mappings": [["assay_id", "assays_assay_id"], ["assay_test_type", "assays_assay_test_type"], ["src_id", "assays_src_id"], ["confidence_score", "assays_confidence_score"], ["cell_id", "assays_cell_id"], ["assay_cell_type", "assays_assay_cell_type"], ["assay_tissue", "assays_assay_tissue"], ["chembl_id", "assays_chembl_id"], ["variant_id", "assays_variant_id"], ["tid", "assays_tid"], ["tissue_id", "assays_tissue_id"], ["assay_strain", "assays_assay_strain"], ["assay_category", "assays_assay_category"], ["src_assay_id", "assays_src_assay_id"], ["relationship_type", "assays_relationship_type"], ["bao_format", "assays_bao_format"], ["doc_id", null], ["description", null], ["assay_type", null]]}