If you have 365 2024, in H2 followed by ENTER:
=LET(d,TOCOL(B4:B13&"|"&TRANSPOSE(B4:B13)),
h,HSTACK(TEXTBEFORE(d,"|"),TEXTAFTER(d,"|")),
FILTER(h,INDEX(h,,1)<>INDEX(h,,2)))
Or this:
=LET(d,TOCOL(B4:B13&"|"&TRANSPOSE(B4:B13)),
h,HSTACK(TEXTBEFORE(d,"|"),TEXTAFTER(d,"|"))...