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

TableB:
|   ss_d |   ss_tx_d | src_ss_d   | crtd_b       | ss_sbclllr_frctn   |    td | ss_tst_tp   | chmbl_d      | tss_d   | ss_ctgr   |   src_d | ss_cll_tp   | rltnshp_tp   |   cnfdnc_scr | cll_d   | b_frmt      | vrnt_d   |
|-------:|----------:|:-----------|:-------------|:-------------------|------:|:------------|:-------------|:--------|:----------|--------:|:------------|:-------------|-------------:|:--------|:------------|:---------|
|   7524 |     10116 |            | Intermediate |                    | 50597 | In vivo     | CHEMBL618647 | 2113.0  |           |       1 |             | N            |            1 |         | BAO_0000218 |          |
|   7525 |     10116 |            | Intermediate |                    | 50597 | In vivo     | CHEMBL618648 | 2113.0  |           |       1 |             | N            |            1 |         | BAO_0000218 |          |
|   7526 |     10116 |            | Intermediate |                    | 50597 | In vivo     | CHEMBL618649 | 2113.0  |           |       1 |             | N            |            1 |         | BAO_0000218 |          |
|   7527 |     10116 |            | Intermediate |                    | 50597 | In vivo     | CHEMBL618650 | 2107.0  |           |       1 |             | N            |            1 |         | BAO_0000218 |          |
|   7528 |     10116 |            | Intermediate |                    | 50597 | In vivo     | CHEMBL618651 | 2107.0  |           |       1 |             | N            |            1 |         | BAO_0000218 |          |
|   7529 |     10116 |            | Intermediate |                    | 50597 | In vivo     | CHEMBL876497 | 2107.0  |           |       1 |             | N            |            1 |         | BAO_0000218 |          |
|   7530 |     10116 |            | Intermediate |                    | 50597 | In vivo     | CHEMBL618652 | 2048.0  |           |       1 |             | N            |            1 |         | BAO_0000218 |          |
|   7531 |     10116 |            | Intermediate |                    | 50597 | In vivo     | CHEMBL618653 | 2048.0  |           |       1 |             | N            |            1 |         | BAO_0000218 |          |
|   7532 |     10116 |            | Intermediate |                    | 50597 | In vivo     | CHEMBL618654 | 2048.0  |           |       1 |             | N            |            1 |         | BAO_0000218 |          |
|   7533 |     10116 |            | Intermediate |                    | 50597 |             | CHEMBL618655 |         |           |       1 |             | N            |            1 |         | BAO_0000218 |          |



source_headers: assay_id
assay_tax_id
src_assay_id
curated_by
assay_subcellular_fraction
tid
assay_test_type
chembl_id
tissue_id
assay_category
src_id
target_headers: ss_d
ss_tx_d
src_ss_d
crtd_b
ss_sbclllr_frctn
td
ss_tst_tp
chmbl_d
tss_d
ss_ctgr
src_d
column_mappings: assay_id
ss_d
assay_tax_id
ss_tx_d
src_assay_id
src_ss_d
curated_by
crtd_b
assay_subcellular_fraction
ss_sbclllr_frctn
tid
td
assay_test_type
ss_tst_tp
chembl_id
chmbl_d
tissue_id
tss_d
assay_category
ss_ctgr
src_id
src_d
output: {"column_mappings": [["assay_id", "ss_d"], ["assay_tax_id", "ss_tx_d"], ["src_assay_id", "src_ss_d"], ["curated_by", "crtd_b"], ["assay_subcellular_fraction", "ss_sbclllr_frctn"], ["tid", "td"], ["assay_test_type", "ss_tst_tp"], ["chembl_id", "chmbl_d"], ["tissue_id", "tss_d"], ["assay_category", "ss_ctgr"], ["src_id", "src_d"], ["doc_id", null], ["description", null], ["assay_type", null], ["assay_organism", null], ["assay_strain", null], ["assay_tissue", null]]}