Construct a huffman code for the following data: | symbol | a | b | c | d | _ | | | | | | | | | frequency | 0.4 | 0.1 | 0.2 | 0.15 | 0.15 | - encode `abacabad` using the code. - decode 100010111001010 using the code.

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?