A software duplicate is a code fragment that is redundant to another code fragment;
often due to copy and paste. A negative consequence of duplication is that if one
fragment is changed, each duplicate may need to be adjusted, too.
Note that a the term software duplicate is preferred over software clone. In
English, clone suggests that one fragment is derived/copied from the other one.
However, this is just one special type of software redundancy. Code fragments could
also be similar by accident.