Identify what is the relationship of the following pairs of sugars?

(a) D-sorbose and D-psicose

(b) D-sorbose and D-fructose

(c) D-erythrose and D-arabinose

(d) D-fructose and L-fructose

(e) D-arabinose and D-ribose

(f) D-ribose and D-ribulose
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