get each pair from a string.

[Vincent Davis]

I am looking for a good way to get every pair from a string. For example,
input:
x = 'apple'
output
'ap'
'pp'
'pl'
'le'

I am not seeing a obvious way to do this without multiple for loops, but
maybe there is not :-)
In the end I am going to what to get triples, quads....... also.

Thanks
Vincent
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