Есть текстовый файл вида
scn_multi_scene_9 multi_scene_9 256 none none 0.000000 0.000000 100.000000 100.000000 -100.000000 0x00000000400032320003c0f300001f9e000011180000031c
0
0
outer_terrain_snow
scn_multi_scene_10 multi_scene_10 256 none none 0.000000 0.000000 100.000000 100.000000 -100.000000 0x000000003009cde1000599630000423b00005756000000af
0
0
outer_terrain_plain
scn_multi_scene_11 multi_scene_11 256 none none 0.000000 0.000000 100.000000 100.000000 -100.000000 0x0000000030015f2b000350d4000011a4000017ee000054af
0
0
outer_terrain_plain
scn_multi_scene_12 multi_scene_12 256 none none 0.000000 0.000000 100.000000 100.000000 -100.000000 0x000000013003d7e30005053f00003b4e0000146300006e84
0
0
outer_terrain_beach
scn_multi_scene_13 multi_scene_13 256 none none 0.000000 0.000000 100.000000 100.000000 -100.000000 0x00000001300389800003a4ea000058340000637a0000399b
0
0
outer_terrain_plain
scn_multi_scene_14 multi_scene_14 256 none none 0.000000 0.000000 100.000000 100.000000 -100.000000 0x0000000040000c910003e8fa0000538900003e9e00005301
0
0
outer_terrain_snow

Вопрос как вставить три строчки меджду вот этими конструкциями

scn_multi_scene_11 multi_scene_11 256 none none 0.000000 0.000000 100.000000 100.000000 -100.000000 0x0000000030015f2b000350d4000011a4000017ee000054af
0
0
outer_terrain_plain
Строка1
Строка2
Строка3
scn_multi_scene_12 multi_scene_12 256 none none 0.000000 0.000000 100.000000 100.000000 -100.000000 0x000000013003d7e30005053f00003b4e0000146300006e84
0
0
outer_terrain_beach