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saltoCaballo(2, 8) # [[1, 6], [3, 6], [4, 7]]

saltoCaballo(3, 4) # [[1, 3], [1, 5], [2, 2], [2, 6], [4, 2], [4, 6], [5, 3], [5, 5]]

saltoCaballo(1, 1) # [[2, 3], [3, 2]]

saltoCaballo(1, 9) # []

check_mathematical_expression("1+1") # true

check_mathematical_expression("1+1+1") # true

check_mathematical_expression("1+1-1*1/1") # true

check_mathematical_expression("10/2.5") # true

check_mathematical_expression("0.10/2.5*5") # true

check_mathematical_expression("") # false

check_mathematical_expression("1+2-a*2") # false

check_mathematical_expression("1+2 -2") # false

removeLineBreak("a\nb"); // "ab"

removeLineBreak("a

b"); // "ab"

removeLineBreak("a <br> b"); // "a  b"

removeLineBreak("a<br />b"); // true

removeLineBreak("a\nb<br>c<BR />d"); // "abcd"

x=[["a", 5, 7], ["c", 3, 4], ["b", 1, 9]]

sortMatrix(x, 0)       # [['a', 5, 7], ['b', 1, 9], ['c', 3, 4]]

sortMatrix(x, 0, True) # [['c', 3, 4], ['b', 1, 9], ['a', 5, 7]]

sortMatrix(x, 1)       # [['b', 1, 9], ['c', 3, 4], ['a', 5, 7]]

sortMatrix(x, 1, True) # [['a', 5, 7], ['c', 3, 4], ['b', 1, 9]]

sortMatrix(x, 2)       # [['c', 3, 4], ['a', 5, 7], ['b', 1, 9]]

sortMatrix(x, 2, True) # [['b', 1, 9], ['a', 5, 7], ['c', 3, 4]]