Answer:
1.
{}
{c} {a} {r} {e}
{c,a} {c,r} {c,e} {a,r} {a,e} {r,e}
{c,a,r} {a,r,e} {r,e,c} {e,c,a}
{c,a,r,e}
2.
{o} {e}
{o,e}
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Answers & Comments
Answer:
1.
{}
{c} {a} {r} {e}
{c,a} {c,r} {c,e} {a,r} {a,e} {r,e}
{c,a,r} {a,r,e} {r,e,c} {e,c,a}
{c,a,r,e}
2.
{}
{o} {e}
{o,e}