With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Charles Dickens was from England.
text_B: In music , Rothenberg propriety is an important concept in the general theory of scales which was introduced by David Rothenberg in a seminal series of papers in 1978 .. David Rothenberg. David Rothenberg. The concept was independently discovered in a more restricted context by Gerald Balzano , who termed it coherence .. Gerald Balzano. Gerald Balzano. The notion belongs to the class of concepts often , but misleadingly , termed diatonic set theory ; in fact , as with most concepts of diatonic set theory , it applies far more widely than simply to the diatonic scale .. diatonic set theory. diatonic set theory. diatonic scale. diatonic scale. A scale is strictly proper if all two step intervals are larger than any one step interval , all three step intervals are larger than any two step interval and so on .. For instance with the diatonic scale , the one step intervals are the semitone and tone , the two step intervals are the minor and major third , the three step intervals are the fourth and tritone , four step intervals are the fifth and tritone .. diatonic scale. diatonic scale. So it 's not strictly proper because the three step intervals and the four step intervals share an interval size -LRB- the tritone -RRB- .. Such a scale is just called `` proper '' .. The twelve equal scale is strictly proper as is any equal tempered scale because it has only one interval size for each number of steps Most tempered scales are proper too .. As another example , the harmonic fragment 5 / 4 , 6 / 4 , 7 / 4 , 8 / 4 is strictly proper , with the one step intervals varying in size from 8 / 7 to 5 / 4 , two step intervals vary from 4 / 3 to 3 / 2 , three step intervals from 8 / 5 to 7 / 4 .. An example of an improper scale is the Japanese Iwato scale .. Iwato scale. Iwato scale. as  : C-D-E-G-A. Its steps in semitones are 2 , 1 , 4 , 1 , 4 .. The single step intervals vary from the semitone from G to A to the major third from A to C. Two step intervals vary from the minor third from C to E and the tritone , from A to D .. There the minor third as a two step interval is smaller than the major third which occurs as a one step interval .
not_related.