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 | cell_id   | bao_format   | assay_tissue   | src_assay_id   | assay_strain   | chembl_id    | assay_subcellular_fraction   | assay_type   | variant_id   |    tid |   doc_id | description                                                                                                 | assay_test_type   | assay_category   | assay_organism   | assay_tax_id   |
|-----------:|:----------|:-------------|:---------------|:---------------|:---------------|:-------------|:-----------------------------|:-------------|:-------------|-------:|---------:|:------------------------------------------------------------------------------------------------------------|:------------------|:-----------------|:-----------------|:---------------|
|          1 |           | hA90000019   |                |                |                | xHEMBL715117 |                              | B            |              |  12052 |    11087 | The compound was tested for the in vitro inhibition of platelet 12-lipoxygenase at a concentration of 30 uM |                   |                  |                  |                |
|          2 |           | BAO9900219   |                |                |                | CHEMBL71t118 |                              | F            |              |  22226 |      684 | Compound was evaluated for its ability to mobilize calcium in 1321NI cells                                  |                   |                  |                  |                |
|          3 |           | BA90p00019   |                |                |                | CH4MBL61511p |                              | B            |              |  22226 |    15453 |                                                                                                             |                   |                  |                  |                |
|          4 |           | vAO00002r9   |                |                |                | CHEMBL626120 |                              | B            |              | 104729 |    17841 | Binding affinity against A2 adenosine receptor in bovine striatal membranes using [3H]CGS-21680             |                   |                  | Bos taurus       | 9913.0         |
|          5 | 496.0     | BzO0o00219   |                |                |                | CHEnBL615221 |                              | F            |              |  80001 |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          |                   |                  | Homo sapiens     | 9606.0         |
|          6 | 492.0     | BAk0000319   |                |                |                | CjEMBL615q22 |                              | F            |              |  80001 |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          |                   |                  | Homo sapiens     | 9606.0         |
|          7 | 417.0     | BA9000o219   |                |                |                | CHfMBLu15123 |                              | F            |              |  80001 |    13799 | Cytotoxic Activity was evaluated against 143B (TK-) tumor cells                                             |                   |                  | Mus musculus     | 10090.0        |
|          8 | 492.0     | vAO0000218   |                |                |                | CHEMBL6141e4 |                              | F            |              |  80001 |    17774 | In vitro cell cytotoxicity was determined against 143B cell line                                            |                   |                  | Homo sapiens     | 9606.0         |
|          9 | 296.0     | BzO0090219   |                |                |                | sHEjBL615125 |                              | F            |              |  80001 |     3801 | Inhibitory activity against tumor osteosarcoma cell line 143B after 72 hr continuous exposure to compound   |                   |                  | Homo sapiens     | 9606.0         |
|         10 | 328.0     | BAO00001w9   |                |                |                | CHEkBL615w26 |                              | F            |              |  80001 |    17430 | In vitro cell cytotoxicity against 143B-LTK cell lines expressed in HSV-1 TK                                |                   |                  | Homo sapiens     | 9606.0         |

TableB:
|   assays_ASSI | assays_CEI   | assays_BFO   | assays_ASTI   | assays_SRASI   | assays_ASSTR   | assays_CHEI   | assays_ASSSUBCELFRA   | assays_AST   | assays_VAI   |   assays_Ti | assays_ASSCTY   | assays_RELATITY   |   assays_CONFSCO | assays_CUB   |   assays_SRI | assays_TII   |
|--------------:|:-------------|:-------------|:--------------|:---------------|:---------------|:--------------|:----------------------|:-------------|:-------------|------------:|:----------------|:------------------|-----------------:|:-------------|-------------:|:-------------|
|          7524 |              | BAO_0000218  | Kidney        |                |                | CHEMBL618647  |                       | A            |              |       50597 |                 | N                 |                1 | Intermediate |            1 | 2113.0       |
|          7525 |              | BAO_0000218  | Kidney        |                |                | CHEMBL618648  |                       | A            |              |       50597 |                 | N                 |                1 | Intermediate |            1 | 2113.0       |
|          7526 |              | BAO_0000218  | Kidney        |                |                | CHEMBL618649  |                       | A            |              |       50597 |                 | N                 |                1 | Intermediate |            1 | 2113.0       |
|          7527 |              | BAO_0000218  | Liver         |                |                | CHEMBL618650  |                       | A            |              |       50597 |                 | N                 |                1 | Intermediate |            1 | 2107.0       |
|          7528 |              | BAO_0000218  | Liver         |                |                | CHEMBL618651  |                       | A            |              |       50597 |                 | N                 |                1 | Intermediate |            1 | 2107.0       |
|          7529 |              | BAO_0000218  | Liver         |                |                | CHEMBL876497  |                       | A            |              |       50597 |                 | N                 |                1 | Intermediate |            1 | 2107.0       |
|          7530 |              | BAO_0000218  | Lung          |                |                | CHEMBL618652  |                       | A            |              |       50597 |                 | N                 |                1 | Intermediate |            1 | 2048.0       |
|          7531 |              | BAO_0000218  | Lung          |                |                | CHEMBL618653  |                       | A            |              |       50597 |                 | N                 |                1 | Intermediate |            1 | 2048.0       |
|          7532 |              | BAO_0000218  | Lung          |                |                | CHEMBL618654  |                       | A            |              |       50597 |                 | N                 |                1 | Intermediate |            1 | 2048.0       |
|          7533 |              | BAO_0000218  |               |                |                | CHEMBL618655  |                       | A            |              |       50597 |                 | N                 |                1 | Intermediate |            1 |              |



source_headers: assay_id
cell_id
bao_format
assay_tissue
src_assay_id
assay_strain
chembl_id
assay_subcellular_fraction
assay_type
variant_id
tid
target_headers: assays_ASSI
assays_CEI
assays_BFO
assays_ASTI
assays_SRASI
assays_ASSTR
assays_CHEI
assays_ASSSUBCELFRA
assays_AST
assays_VAI
assays_Ti
column_mappings: assay_id
assays_ASSI
cell_id
assays_CEI
bao_format
assays_BFO
assay_tissue
assays_ASTI
src_assay_id
assays_SRASI
assay_strain
assays_ASSTR
chembl_id
assays_CHEI
assay_subcellular_fraction
assays_ASSSUBCELFRA
assay_type
assays_AST
variant_id
assays_VAI
tid
assays_Ti
output: {"column_mappings": [["assay_id", "assays_ASSI"], ["cell_id", "assays_CEI"], ["bao_format", "assays_BFO"], ["assay_tissue", "assays_ASTI"], ["src_assay_id", "assays_SRASI"], ["assay_strain", "assays_ASSTR"], ["chembl_id", "assays_CHEI"], ["assay_subcellular_fraction", "assays_ASSSUBCELFRA"], ["assay_type", "assays_AST"], ["variant_id", "assays_VAI"], ["tid", "assays_Ti"], ["doc_id", null], ["description", null], ["assay_test_type", null], ["assay_category", null], ["assay_organism", null], ["assay_tax_id", null]]}