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{"sheet":"Challenge 1","index":0,"n_rows":25,"n_cols":2,"rows_kept":25,"cut":false,"hidden":false,"merged":[]}
["20 - 13"]
["14 - 3"]
["7 - 2"]
["1 + 18"]
["6 + 4"]
["7 - 1"]
["6 - 6"]
["17 + 1"]
["16 - 10"]
["17 -2"]
["12 - 12","?"]
["18 - 1"]
["19 - 9"]
["5 - 2"]
["9 - 2"]
["7 + 9"]
["12 + 8"]
["11 - 2"]
["16 + 0"]
["2 + 8"]
["8 - 7"]
["11 - 3"]
["10 + 8"]
["6 + 3"]
["2 + 10"]

{"sheet":"Challenge 2","index":1,"n_rows":25,"n_cols":2,"rows_kept":25,"cut":false,"hidden":false,"merged":[]}
["3 + 15"]
["1 + 2"]
["11 + 6"]
["20 - 3"]
["8 + 11"]
["7 + 3"]
["13 - 11"]
["15 - 2"]
["17 + 3"]
["8 - 4"]
["18 - 16"]
["1 + 9"]
["13 - 9"]
["4 + 12"]
["15 + 5"]
["0 + 10"]
["4 - 3"]
["2 + 18"]
["14 + 1"]
["1 + 15"]
["8 + 5"]
["20 - 5"]
["8 - 8","?"]
["9 + 2"]
["14 - 7"]

{"sheet":"Challenge 3","index":2,"n_rows":25,"n_cols":2,"rows_kept":25,"cut":false,"hidden":false,"merged":[]}
["17 + 2"]
["11 - 1"]
["18 - 12"]
["9 + 3"]
["0 + 7"]
["4 - 0"]
["18 + 0"]
["15 - 15","?"]
["1 + 7"]
["6 - 5"]
["5 + 3"]
["2 - 1"]
["19 - 13"]
["20 - 19"]
["5 - 1"]
["5 - 3"]
["14 + 2"]
["0 - 0","?"]
["15 - 7"]
["4 + 2"]
["13 - 8"]
["17 - 12"]
["8 + 1"]
["18 - 6"]
["16 - 9"]

{"sheet":"Challenge 4","index":3,"n_rows":25,"n_cols":1,"rows_kept":25,"cut":false,"hidden":false,"merged":[]}
["16 - 0"]
["16 - 15"]
["13 - 10"]
["19 - 5"]
["10 + 7"]
["3 + 12"]
["15 - 9"]
["17 - 14"]
["7 - 0 "]
["2 + 12 "]
["11 - 8"]
["16 - 6"]
["3 + 7"]
["4 + 11"]
["16 - 13"]
["9 + 5"]
["0 + 12 "]
["3 + 14 "]
["8 + 4"]
["16 + 3"]
["7 + 10"]
["7 + 12"]
["9 - 6"]
["7 + 7"]
["8 - 3"]

{"sheet":"Challenge 5","index":4,"n_rows":25,"n_cols":42,"rows_kept":25,"cut":false,"hidden":false,"merged":[]}
["13 - 5"]
["14 - 8"]
["13 - 3"]
["17 - 11"]
["5 + 0 "]
["6 - 1"]
["12 - 6"]
["6 + 8"]
["0 + 20",{"$nulls":40}," "]
["18 - 2"]
["13 - 12"]
["13 - 7"]
["17 - 7"]
["11 + 4"]
["7 + 13"]
["1 + 6"]
["18 - 11"]
["17 - 8"]
["14 - 9"]
["1 + 12"]
["20 - 17"]
["11 - 6"]
["7 + 5"]
["0 + 11"]
["3 + 0 "]