<?php

$array = ['Лена', 'Оля', 'Дана'];
$parts = [
	[[0, 1], [0, 1, 2]],
	[[1, 2], [1, 2, 0]],
	[[2, 0], [2, 0, 1]],
	[[0, 2], [0, 2, 1]],
	[[1, 0], [1, 0, 2]],
	[[2, 1], [2, 1, 0]],
];

$strings = [];
foreach ($parts as $part) {
	$firstPart  = $part[0];
	$secondPart = $part[1];
	
	$firstString = '';
	foreach($firstPart as $key) {
		$firstString .= $array[$key];
	}
	
	$secondString = '';
	foreach ($secondPart as $key) {
		$secondString .= $array[$key];
	}
	
	$strings[] = $firstString . ' ' . $secondString;
}

echo implode("\n", $strings);

 ?>