The answer to this question is already partially in the question: Picasso wanted to show show the horrors of the war, as experienced by the civil population, to the world. He wanted to show that war has devastating effects and by this turn people's opinions against the war.
The bombing was also done by the fascists so the painting can be seen as a symbol for the fights against the fascists.
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Brass. Trumpets, trombones, French horns, tubas, and baritones all fall under the brass category and all require air to be blown through them.
Lectures are educational talks or long speeches.
Look up Egyptian symbols on the internet. They will all come up with their meanings.
