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_subcellular_fraction   |   confidence_score | description                                                                                 | assay_organism   | assay_strain   | variant_id   | assay_tissue   | tissue_id   | cell_id   |   src_id | assay_tax_id   | assay_type   | chembl_id    |    tid | assay_category   |   doc_id | assay_test_type   | assay_cell_type   |
|-----------:|:-----------------------------|-------------------:|:--------------------------------------------------------------------------------------------|:-----------------|:---------------|:-------------|:---------------|:------------|:----------|---------:|:---------------|:-------------|:-------------|-------:|:-----------------|---------:|:------------------|:------------------|
|          1 |                              |                  8 | Th4compkundwastestedfortheihvitd0inhibi4iobpdplatelet12liooxygenaseatasogcentrarionoc40kn   |                  |                |              |                |             |           |        1 |                | B            | CHEMBk625117 |  12052 |                  |    11087 |                   |                   |
|          2 |                              |                  0 | Comp0undwssevalistdwforitszbility6om9biliaecalc7umin1321hIcells                             |                  |                |              |                |             |           |        1 |                | F            | CHEhBi615118 |  22226 |                  |      684 |                   |                   |
|          3 |                              |                  0 |                                                                                             |                  |                |              |                |             |           |        1 |                | B            | vuEMBL615119 |  22226 |                  |    15453 |                   |                   |
|          4 |                              |                  4 | Bondingxffinu6usgwinstA2adehozinereceptorinbkvinestriztalmehh4anesusinn3HCGS21u80           | Bkstaurus        |                |              |                |             |           |        1 | 4525.0         | B            | CHEMBi615w20 | 104729 |                  |    17841 |                   |                   |
|          5 |                              |                  1 | Invitgocellcytotoxicittwfainwtq43Bcelloin3sghnanosteosarcomqcelllinr                        | Homocapi3ns      |                |              |                |             | 329.0     |        1 | 17175.0        | F            | CHEkBL625121 |  80001 |                  |    17430 |                   | 143B              |
|          6 |                              |                  1 | Invlt59cellxyt8yoxicit7against143fcelll9neqHumanozteowarcojacellline                        | tomosaliens      |                |              |                |             | 44.0      |        1 | 56410.0        | F            | CHdMBL6q5122 |  80001 |                  |    17430 |                   | 143B              |
|          7 |                              |                  1 | vytotoxisActovktuwasevaluatedagsinst143ByKtukldcells                                        | Muamusfulus      |                |              |                |             | 339.0     |        1 | 38996.0        | F            | CHEMgL625123 |  80001 |                  |    13799 |                   | 143B              |
|          8 |                              |                  1 | lmgitrocellcytotoxlc7tywasde4ermihedagaunsy143vcelllkne                                     | uomosapidns      |                |              |                |             | 197.0     |        1 | 50742.0        | F            | CbEkBL615124 |  80001 |                  |    17774 |                   | 143B              |
|          9 |                              |                  1 | Inhibitor5wctivityagwinc5tumorowtsoaarcokacelll8ne133Bafter72hrsobtiniousexposuretocom0okmv | H0moqapiens      |                |              |                |             | 398.0     |        1 | 16272.0        | F            | CHEjBi615125 |  80001 |                  |     3801 |                   | 143B              |
|         10 |                              |                  1 | Invutrodelpc5to6oxisityagainst143goTKcelllkbesexpr3ssedlnHSV1TK                             | Hohosapjens      |                |              |                |             | 400.0     |        1 | 849.0          | F            | CHEjBL715126 |  80001 |                  |    17430 |                   | 143B              |

TableB:
|   ss_d | ss_sbclllr_frctn   |   cnfdnc_scr | dscrptn                                                                                                  | ss_rgnsm          | ss_strn   | vrnt_d   | ss_tss   | tss_d   | cll_d   |   src_d |   ss_tx_d | ss_tp   | chmbl_d      |    td | ss_ctgr   | rltnshp_tp   | crtd_b       | src_ss_d   | b_frmt      |
|-------:|:-------------------|-------------:|:---------------------------------------------------------------------------------------------------------|:------------------|:----------|:---------|:---------|:--------|:--------|--------:|----------:|:--------|:-------------|------:|:----------|:-------------|:-------------|:-----------|:------------|
|   7524 |                    |            1 | Biodistribution in normal rat kidney in the presence of 0.005 M Gd/0.01 M lig at 2 hr                    | Rattus norvegicus |           |          | Kidney   | 2113.0  |         |       1 |     10116 | A       | CHEMBL618647 | 50597 |           | N            | Intermediate |            | BAO_0000218 |
|   7525 |                    |            1 | Biodistribution in normal rat kidney in the presence of 0.01 M Gd/0.05 M lig                             | Rattus norvegicus |           |          | Kidney   | 2113.0  |         |       1 |     10116 | A       | CHEMBL618648 | 50597 |           | N            | Intermediate |            | BAO_0000218 |
|   7526 |                    |            1 | Biodistribution in normal rat kidney in the presence of NAC Gd 0.01 M lig at 2 hr                        | Rattus norvegicus |           |          | Kidney   | 2113.0  |         |       1 |     10116 | A       | CHEMBL618649 | 50597 |           | N            | Intermediate |            | BAO_0000218 |
|   7527 |                    |            1 | Biodistribution in normal rat liver in the presence of 0.005 M Gd/0.01 M lig at 2 hr                     | Rattus norvegicus |           |          | Liver    | 2107.0  |         |       1 |     10116 | A       | CHEMBL618650 | 50597 |           | N            | Intermediate |            | BAO_0000218 |
|   7528 |                    |            1 | Biodistribution in normal rat liver in the presence of 0.01 M Gd/0.05 M lig                              | Rattus norvegicus |           |          | Liver    | 2107.0  |         |       1 |     10116 | A       | CHEMBL618651 | 50597 |           | N            | Intermediate |            | BAO_0000218 |
|   7529 |                    |            1 | Biodistribution in normal rat liver in the presence of NAC Gd 0.01 M lig at 2 hr                         | Rattus norvegicus |           |          | Liver    | 2107.0  |         |       1 |     10116 | A       | CHEMBL876497 | 50597 |           | N            | Intermediate |            | BAO_0000218 |
|   7530 |                    |            1 | Biodistribution in normal rat lung in the presence of 0.005 M Gd/0.01 M lig at 2 hr                      | Rattus norvegicus |           |          | Lung     | 2048.0  |         |       1 |     10116 | A       | CHEMBL618652 | 50597 |           | N            | Intermediate |            | BAO_0000218 |
|   7531 |                    |            1 | Biodistribution in normal rat lung in the presence of 0.01 M Gd/0.05 M lig                               | Rattus norvegicus |           |          | Lung     | 2048.0  |         |       1 |     10116 | A       | CHEMBL618653 | 50597 |           | N            | Intermediate |            | BAO_0000218 |
|   7532 |                    |            1 | Biodistribution in normal rat lung in the presence of NAC Gd 0.01 M lig at 2 hr                          | Rattus norvegicus |           |          | Lung     | 2048.0  |         |       1 |     10116 | A       | CHEMBL618654 | 50597 |           | N            | Intermediate |            | BAO_0000218 |
|   7533 |                    |            1 | Recovery rate from urine and bile was determined after iv administration at 20 mg/kg in rats; Not tested | Rattus norvegicus |           |          |          |         |         |       1 |     10116 | A       | CHEMBL618655 | 50597 |           | N            | Intermediate |            | BAO_0000218 |



source_headers: assay_id
assay_subcellular_fraction
confidence_score
description
assay_organism
assay_strain
variant_id
assay_tissue
tissue_id
cell_id
src_id
assay_tax_id
assay_type
chembl_id
tid
assay_category
target_headers: ss_d
ss_sbclllr_frctn
cnfdnc_scr
dscrptn
ss_rgnsm
ss_strn
vrnt_d
ss_tss
tss_d
cll_d
src_d
ss_tx_d
ss_tp
chmbl_d
td
ss_ctgr
column_mappings: assay_id
ss_d
assay_subcellular_fraction
ss_sbclllr_frctn
confidence_score
cnfdnc_scr
description
dscrptn
assay_organism
ss_rgnsm
assay_strain
ss_strn
variant_id
vrnt_d
assay_tissue
ss_tss
tissue_id
tss_d
cell_id
cll_d
src_id
src_d
assay_tax_id
ss_tx_d
assay_type
ss_tp
chembl_id
chmbl_d
tid
td
assay_category
ss_ctgr
output: {"column_mappings": [["assay_id", "ss_d"], ["assay_subcellular_fraction", "ss_sbclllr_frctn"], ["confidence_score", "cnfdnc_scr"], ["description", "dscrptn"], ["assay_organism", "ss_rgnsm"], ["assay_strain", "ss_strn"], ["variant_id", "vrnt_d"], ["assay_tissue", "ss_tss"], ["tissue_id", "tss_d"], ["cell_id", "cll_d"], ["src_id", "src_d"], ["assay_tax_id", "ss_tx_d"], ["assay_type", "ss_tp"], ["chembl_id", "chmbl_d"], ["tid", "td"], ["assay_category", "ss_ctgr"], ["doc_id", null], ["assay_test_type", null], ["assay_cell_type", null]]}