H7475–רַעְיוֹן–ra.yon

And I give my heart to know wisdom, and to know madness and folly: I have known that even this `is' vexation of spirit;

רַעְי֥וֹן ra'.Yon “[is] a striving of”

For what hath been to a man by all his labour, and by the thought of his heart that he laboured at under the sun?

וּבְרַעְי֖וֹן (רַעְי֖וֹן) ra'.Yon “[the] striving of”

there is no end to all the people, to all who were before them; also, the latter rejoice not in him. Surely this also is vanity and vexation of spirit.

וְרַעְי֥וֹן (רַעְי֥וֹן) ra'.Yon “a striving of”