remove a substring from a string

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remove a substring from a string

Please I jave an arraylist composed as follwoing [w1, w2, w3, w4, w1.w2.w3, w2.w3.w4, w3.w4, w2.w4, w1.w3, w1.w2]

w2.w4 is a subset of w2.w3.w4 ?how I recognize it

also

w1.w3 is a subset of w1.w2.w3 ?how I recognize it

same for w1.w2 in w1.w2.w3.

I nedd your help.

Thanks a lot

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