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 | description                                                                                 | assay_organism   |   confidence_score |    tid |   doc_id | assay_type   | assay_test_type   | assay_category   | assay_tax_id   | assay_strain   | assay_tissue   | assay_cell_type   |
|-----------:|---------:|:--------------------------------------------------------------------------------------------|:-----------------|-------------------:|-------:|---------:|:-------------|:------------------|:-----------------|:---------------|:---------------|:---------------|:------------------|
|          1 |        1 | Tbecpmpo8nrwasfestexfortheinvitroighkb8tiomofpla6elet1elipoxyg2naseatsconcentrztionif39uM   |                  |                  8 |  12052 |    11087 | B            |                   |                  |                |                |                |                   |
|          2 |        1 | dompoundwasebapuatevforigsabilitutomobiliz4calviunin132qNIcelkz                             |                  |                  0 |  22226 |      684 | F            |                   |                  |                |                |                |                   |
|          3 |        1 |                                                                                             |                  |                  0 |  22226 |    15453 | B            |                   |                  |                |                |                |                   |
|          4 |        1 | hinvingaffinjyyqvainstAqadenosimereceltirinbovin2s6riatalmemgrajesuqing3HCGS2168o           | Bos4aurus        |                  4 | 104729 |    17841 | B            |                   |                  | 9913.0         |                |                |                   |
|          5 |        1 | onvitrocwllcytotoxicit6against14rhfeiipinesbunamosteoszrcomacellline                        | Hom8sapiebs      |                  1 |  80001 |    17430 | F            |                   |                  | 9606.0         |                |                | 143B              |
|          6 |        1 | Invit5ocellsyto6oxixityanw8nst14wBcekplinesHumanosteosarcokacellkinw                        | Homosz9iens      |                  1 |  80001 |    17430 | F            |                   |                  | 9606.0         |                |                | 143B              |
|          7 |        1 | Cyt9toxiczstivitywqsfvaluatefxgainst143Bgitumorcellc                                        | Musmuxcuous      |                  1 |  80001 |    13799 | F            |                   |                  | 10090.0        |                |                | 143B              |
|          8 |        1 | 7nvitrocelpfytltoxicitydaswet4rmihedagxinst143Bcelloinw                                     | Homoswpiejs      |                  1 |  80001 |    17774 | F            |                   |                  | 9606.0         |                |                | 143B              |
|          9 |        1 | Inhifitoryachivityxgainctt7morosyeosz5comadeollihf143Baffer72hrcomtknh0usexposuretocompo6nd | Homosapidms      |                  1 |  80001 |     3801 | F            |                   |                  | 9606.0         |                |                | 143B              |
|         10 |        1 | Invitroc3llsyt8tpxici4yagainwtw43BpTKcwlliinesexp3essedinHwV1TK                             | gomosa9iens      |                  1 |  80001 |    17430 | F            |                   |                  | 9606.0         |                |                | 143B              |

TableB:
|   assays_ss_d |   assays_src_d | assays_dscrptn                                                                                           | assays_ss_rgnsm   |   assays_cnfdnc_scr |   assays_td | assays_ss_sbclllr_frctn   | assays_rltnshp_tp   | assays_crtd_b   | assays_src_ss_d   | assays_chmbl_d   | assays_cll_d   | assays_b_frmt   | assays_tss_d   | assays_vrnt_d   |
|--------------:|---------------:|:---------------------------------------------------------------------------------------------------------|:------------------|--------------------:|------------:|:--------------------------|:--------------------|:----------------|:------------------|:-----------------|:---------------|:----------------|:---------------|:----------------|
|          7524 |              1 | Biodistribution in normal rat kidney in the presence of 0.005 M Gd/0.01 M lig at 2 hr                    | Rattus norvegicus |                   1 |       50597 |                           | N                   | Intermediate    |                   | CHEMBL618647     |                | BAO_0000218     | 2113.0         |                 |
|          7525 |              1 | Biodistribution in normal rat kidney in the presence of 0.01 M Gd/0.05 M lig                             | Rattus norvegicus |                   1 |       50597 |                           | N                   | Intermediate    |                   | CHEMBL618648     |                | BAO_0000218     | 2113.0         |                 |
|          7526 |              1 | Biodistribution in normal rat kidney in the presence of NAC Gd 0.01 M lig at 2 hr                        | Rattus norvegicus |                   1 |       50597 |                           | N                   | Intermediate    |                   | CHEMBL618649     |                | BAO_0000218     | 2113.0         |                 |
|          7527 |              1 | Biodistribution in normal rat liver in the presence of 0.005 M Gd/0.01 M lig at 2 hr                     | Rattus norvegicus |                   1 |       50597 |                           | N                   | Intermediate    |                   | CHEMBL618650     |                | BAO_0000218     | 2107.0         |                 |
|          7528 |              1 | Biodistribution in normal rat liver in the presence of 0.01 M Gd/0.05 M lig                              | Rattus norvegicus |                   1 |       50597 |                           | N                   | Intermediate    |                   | CHEMBL618651     |                | BAO_0000218     | 2107.0         |                 |
|          7529 |              1 | Biodistribution in normal rat liver in the presence of NAC Gd 0.01 M lig at 2 hr                         | Rattus norvegicus |                   1 |       50597 |                           | N                   | Intermediate    |                   | CHEMBL876497     |                | BAO_0000218     | 2107.0         |                 |
|          7530 |              1 | Biodistribution in normal rat lung in the presence of 0.005 M Gd/0.01 M lig at 2 hr                      | Rattus norvegicus |                   1 |       50597 |                           | N                   | Intermediate    |                   | CHEMBL618652     |                | BAO_0000218     | 2048.0         |                 |
|          7531 |              1 | Biodistribution in normal rat lung in the presence of 0.01 M Gd/0.05 M lig                               | Rattus norvegicus |                   1 |       50597 |                           | N                   | Intermediate    |                   | CHEMBL618653     |                | BAO_0000218     | 2048.0         |                 |
|          7532 |              1 | Biodistribution in normal rat lung in the presence of NAC Gd 0.01 M lig at 2 hr                          | Rattus norvegicus |                   1 |       50597 |                           | N                   | Intermediate    |                   | CHEMBL618654     |                | BAO_0000218     | 2048.0         |                 |
|          7533 |              1 | Recovery rate from urine and bile was determined after iv administration at 20 mg/kg in rats; Not tested | Rattus norvegicus |                   1 |       50597 |                           | N                   | Intermediate    |                   | CHEMBL618655     |                | BAO_0000218     |                |                 |



source_headers: assay_id
src_id
description
assay_organism
confidence_score
tid
target_headers: assays_ss_d
assays_src_d
assays_dscrptn
assays_ss_rgnsm
assays_cnfdnc_scr
assays_td
column_mappings: assay_id
assays_ss_d
src_id
assays_src_d
description
assays_dscrptn
assay_organism
assays_ss_rgnsm
confidence_score
assays_cnfdnc_scr
tid
assays_td
output: {"column_mappings": [["assay_id", "assays_ss_d"], ["src_id", "assays_src_d"], ["description", "assays_dscrptn"], ["assay_organism", "assays_ss_rgnsm"], ["confidence_score", "assays_cnfdnc_scr"], ["tid", "assays_td"], ["doc_id", null], ["assay_type", null], ["assay_test_type", null], ["assay_category", null], ["assay_tax_id", null], ["assay_strain", null], ["assay_tissue", null], ["assay_cell_type", null]]}