R Find the “groups” of tuples Languages

R Find the “groups” of tuples

I try to find the "group" (id3) based on two variables (id1, id2):For example id1=1 is related to a and b of id2. But id1=2 is also related to a so both belong to one group (id3=group1). But since id1=2 and id1=3 share id2=c, also id1=3 belongs to that group...
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