What constitutes "several" of something is contextual, I would say. Things which typically come in small numbers may be referred to as several when in numbers as low as three and still convey the described connotation. If someone were to say they had several nipples, you might not find their choice of words frustrating if it turns out they have three as you would naturally expect people to only have two. Anything more than two is exceptional, justifying the use of "several" if the requirement is the connotation described.
I guess a someone with three nipples who can't count to three could be considered utterly flawless and beyond reproach, but somehow, idk, I think the description would still lead to some amount of disappointment in the discovery of its mismatch with reality.
To me, someone saying "several", when they could, without error, say "three" is plainly hamming it up, rather than using the word accurately. It should be used for a number where the difference between any potential exact figures isn't significant.
Someone with three nipples could be expected to describe them as "countless!", but contextual acceptability of inaccuracy doesn't accuracy make.
I do appreciate your seemingly rational attempt to eat away at the edges of reasonable enumeration, but I think we must sever the head, lest it lead us to some circle of hell roughly between seven and twelve.
can two people be alone? For example "let us be alone together".
Sure thing - groups can be alone. In your example, the thing that lacks company is the "us", rather than its individual constituents.
People can also be alone from something in particular. Even being alone
from each other is something that two people can do together - being united by their shared situation, rather than physical proximity.
Alternatively, they could be alone
in their respective activities, despite being physically touching, e.g. "They sat and held hands, but John was alone in his quest to memorise Pi in its entirety, while Jane had no company in her pursuit of making louder noises than the human mind can withstand".
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