Stuttering is a speech disorder characterized by repetition of sounds, syllables, or words; prolongation of sounds; and interruptions in speech known as blocks. An individual who stutters exactly knows what he or she would like to say but has trouble producing a normal flow of speech.
The 3 types of RNA are mRNA is a long strand, the tRNA is shaped  like a clover leaf pattern. The third shape is Ribosomal RNA, it  is a very complex shape.
However, there  are three different types of RNA including:   mRNA (messenger RNA) carries messages coded in DNA from  the nucleus or nucleoid to the site of protein synthesis  (ribosomes) in cytoplasm.  rRNA (ribosomal RNA) is found in the structure of  ribosomes, together with ribosomal proteins.