psycho*
This is the best place for the truncation sign to be placed in order capture all the relevant material containing the same root.
If you place the truncation sign too early in a word too many words will be retrieved. For example, psych* would bring up; psyche, psychiatrist, psychedelic etc.
Likewise if you place the truncation sign too late in a word you could miss relevant words altogether. For example, psycholog* would bring up psychology , psychologist, psychological but miss out the phrase psychoanalyst.
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