List the following bonds in order of increasing ionic character:
csf, clcl, brcl, sic

Explanation:

We can determine the ionic character of a bond by using the periodic table of elements. We look up the electronegativity of both elements: the bigger the difference of electronegativity between the elements, the bigger the ionic character of the bond is.

With that in mind, in order of increasing ionic character, the answer is:

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