Does the sentence "Although an explanation for the phenomenon was not provided until 1919, duralumin was one of the first "age hardening" alloys to be used, and was soon followed by many others." provide a valid answer to the question "What was used in the construction of modern aircraft?" OPTIONS:
- yes
- no

A: yes

Does the sentence "Illyrians imported weapons and armor from the Ancient Greeks (such as the Illyrian type helmet, originally a Greek type) and also adopted the ornamentation of Ancient Macedon on their shields and their war belts (a single one has been found, dated 3rd century BC at modern Selce e Poshtme part of Macedon at the time under Philip V of Macedon)." provide a valid answer to the question "From where did Illyrians import there weapons and armor?" OPTIONS:
- yes
- no

A: yes

Does the sentence "A complex tone composed of two sine waves of 1000 and 1200 Hz may sometimes be heard as up to three pitches: two spectral pitches at 1000 and 1200 Hz, derived from the physical frequencies of the pure tones, and the combination tone at 200 Hz, corresponding to the repetition rate of the waveform." provide a valid answer to the question "The pitch of complex tones can be?" OPTIONS:
- yes
- no

A: no

Does the sentence "It also became a center of slavery, with 42% of households holding slaves by 1730, more than any other city other than Charleston, South Carolina." provide a valid answer to the question "Which city in North America held the most slaves in the 1700s?" OPTIONS:
- yes
- no

A:
yes