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 | tissue_id   | curated_by   | assay_tissue   |    tid | description                                                                                                 | chembl_id    | relationship_type   |   confidence_score | cell_id   | assay_cell_type   |   doc_id | assay_type   | assay_test_type   | assay_category   | assay_organism   | assay_tax_id   |
|-----------:|:------------|:-------------|:---------------|-------:|:------------------------------------------------------------------------------------------------------------|:-------------|:--------------------|-------------------:|:----------|:------------------|---------:|:-------------|:------------------|:-----------------|:-----------------|:---------------|
|          1 |             | Autocuration |                |  12052 | The compound was tested for the in vitro inhibition of platelet 12-lipoxygenase at a concentration of 30 uM | CHEMBL615117 | H                   |                  8 |           |                   |    11087 | B            |                   |                  |                  |                |
|          2 |             | Autocuration |                |  22226 | Compound was evaluated for its ability to mobilize calcium in 1321NI cells                                  | CHEMBL615118 | U                   |                  0 |           |                   |      684 | F            |                   |                  |                  |                |
|          3 |             | Autocuration |                |  22226 |                                                                                                             | CHEMBL615119 | U                   |                  0 |           |                   |    15453 | B            |                   |                  |                  |                |
|          4 |             | Autocuration |                | 104729 | Binding affinity against A2 adenosine receptor in bovine striatal membranes using [3H]CGS-21680             | CHEMBL615120 | H                   |                  4 |           |                   |    17841 | B            |                   |                  | Bos taurus       | 9913.0         |
|          5 |             | Intermediate |                |  80001 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | CHEMBL615121 | N                   |                  1 | 163.0     | 143B              |    17430 | F            |                   |                  | Homo sapiens     | 9606.0         |
|          6 |             | Intermediate |                |  80001 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | CHEMBL615122 | N                   |                  1 | 163.0     | 143B              |    17430 | F            |                   |                  | Homo sapiens     | 9606.0         |
|          7 |             | Intermediate |                |  80001 | Cytotoxic Activity was evaluated against 143B (TK-) tumor cells                                             | CHEMBL615123 | N                   |                  1 | 163.0     | 143B              |    13799 | F            |                   |                  | Mus musculus     | 10090.0        |
|          8 |             | Expert       |                |  80001 | In vitro cell cytotoxicity was determined against 143B cell line                                            | CHEMBL615124 | N                   |                  1 | 163.0     | 143B              |    17774 | F            |                   |                  | Homo sapiens     | 9606.0         |
|          9 |             | Intermediate |                |  80001 | Inhibitory activity against tumor osteosarcoma cell line 143B after 72 hr continuous exposure to compound   | CHEMBL615125 | N                   |                  1 | 163.0     | 143B              |     3801 | F            |                   |                  | Homo sapiens     | 9606.0         |
|         10 |             | Intermediate |                |  80001 | In vitro cell cytotoxicity against 143B-LTK cell lines expressed in HSV-1 TK                                | CHEMBL615126 | N                   |                  1 | 163.0     | 143B              |    17430 | F            |                   |                  | Homo sapiens     | 9606.0         |

TableB:
|   ss_d | tss_d   | crtd_b       | ss_tss   |     td | dscrptn                                                                                                     | chmbl_d      | rltnshp_tp   |   cnfdnc_scr | cll_d   | ss_cll_tp   | ss_strn   | ss_sbclllr_frctn   |   src_d | src_ss_d   | b_frmt      | vrnt_d   |
|-------:|:--------|:-------------|:---------|-------:|:------------------------------------------------------------------------------------------------------------|:-------------|:-------------|-------------:|:--------|:------------|:----------|:-------------------|--------:|:-----------|:------------|:---------|
|      1 |         | Autocuration |          |  12052 | The compound was tested for the in vitro inhibition of platelet 12-lipoxygenase at a concentration of 30 uM | CHEMBL615117 | H            |            8 |         |             |           |                    |       1 |            | BAO_0000019 |          |
|      2 |         | Autocuration |          |  22226 | Compound was evaluated for its ability to mobilize calcium in 1321NI cells                                  | CHEMBL615118 | U            |            0 |         |             |           |                    |       1 |            | BAO_0000219 |          |
|      3 |         | Autocuration |          |  22226 |                                                                                                             | CHEMBL615119 | U            |            0 |         |             |           |                    |       1 |            | BAO_0000019 |          |
|      4 |         | Autocuration |          | 104729 | Binding affinity against A2 adenosine receptor in bovine striatal membranes using [3H]CGS-21680             | CHEMBL615120 | H            |            4 |         |             |           |                    |       1 |            | BAO_0000249 |          |
|      5 |         | Intermediate |          |  80001 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | CHEMBL615121 | N            |            1 | 163.0   | 143B        |           |                    |       1 |            | BAO_0000219 |          |
|      6 |         | Intermediate |          |  80001 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | CHEMBL615122 | N            |            1 | 163.0   | 143B        |           |                    |       1 |            | BAO_0000219 |          |
|      7 |         | Intermediate |          |  80001 | Cytotoxic Activity was evaluated against 143B (TK-) tumor cells                                             | CHEMBL615123 | N            |            1 | 163.0   | 143B        |           |                    |       1 |            | BAO_0000219 |          |
|      8 |         | Expert       |          |  80001 | In vitro cell cytotoxicity was determined against 143B cell line                                            | CHEMBL615124 | N            |            1 | 163.0   | 143B        |           |                    |       1 |            | BAO_0000219 |          |
|      9 |         | Intermediate |          |  80001 | Inhibitory activity against tumor osteosarcoma cell line 143B after 72 hr continuous exposure to compound   | CHEMBL615125 | N            |            1 | 163.0   | 143B        |           |                    |       1 |            | BAO_0000219 |          |
|     10 |         | Intermediate |          |  80001 | In vitro cell cytotoxicity against 143B-LTK cell lines expressed in HSV-1 TK                                | CHEMBL615126 | N            |            1 | 163.0   | 143B        |           |                    |       1 |            | BAO_0000219 |          |



source_headers: assay_id
tissue_id
curated_by
assay_tissue
tid
description
chembl_id
relationship_type
confidence_score
cell_id
assay_cell_type
target_headers: ss_d
tss_d
crtd_b
ss_tss
td
dscrptn
chmbl_d
rltnshp_tp
cnfdnc_scr
cll_d
ss_cll_tp
column_mappings: assay_id
ss_d
tissue_id
tss_d
curated_by
crtd_b
assay_tissue
ss_tss
tid
td
description
dscrptn
chembl_id
chmbl_d
relationship_type
rltnshp_tp
confidence_score
cnfdnc_scr
cell_id
cll_d
assay_cell_type
ss_cll_tp
output: {"column_mappings": [["assay_id", "ss_d"], ["tissue_id", "tss_d"], ["curated_by", "crtd_b"], ["assay_tissue", "ss_tss"], ["tid", "td"], ["description", "dscrptn"], ["chembl_id", "chmbl_d"], ["relationship_type", "rltnshp_tp"], ["confidence_score", "cnfdnc_scr"], ["cell_id", "cll_d"], ["assay_cell_type", "ss_cll_tp"], ["doc_id", null], ["assay_type", null], ["assay_test_type", null], ["assay_category", null], ["assay_organism", null], ["assay_tax_id", null]]}